4. SUMMARY OF REVISED AGE ASSIGNMENTS FOR ODP LEG

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4. SUMMARY OF REVISED AGE ASSIGNMENTS FOR ODP LEG Powered By Docstoc
					Huchon, P., Taylor, B., and Klaus, A. (Eds.)
Proceedings of the Ocean Drilling Program, Scientific Results Volume 180




4. SUMMARY OF REVISED AGE
ASSIGNMENTS FOR ODP LEG 1801
                                                                            1 Takahashi,  K., Cortese, G., Frost, G.M.,
                                                                            Gerbaudo, S., Goodliffe, A.M.,
Kyoma   Takahashi,2 Giuseppe      Cortese,3
                                         Gina M.       Frost,4              Ishikawa, N., Lackschewitz, K.S.,
Stefania Gerbaudo,5 Andrew M. Goodliffe,6 Naoto Ishikawa,7                  Perembo, R.C.B., Resig, J.M., Siesser,
Klas S. Lackschewitz,8 Russell C.B. Perembo,9 Johanna M. Resig,6            W.G., Taylor, B., and Testa, M., 2001.
William G. Siesser,10 Brian Taylor,6 and Massimiliano Testa5                Summary of revised age assignments
                                                                            for ODP Leg 180. In Huchon, P., Taylor,
                                                                            B., and Klaus, A. (Eds.), Proc. ODP, Sci.
                                                                            Results, 180, 1–13 [Online]. Available
                                                                            from World Wide Web:
                                                                            <http://www-odp. tamu.edu/publications/
                                                                            180_SR/VOLUME/CHAPTERS/152.PDF>.
                                                                            [Cited YYYY-MM-DD]
                                                                            2 Interactive Research Center of Science,

                                                                            Tokyo Institute of Technology,
                                                                            Ookayama, Tokyo 152-8551, Japan.
                             ABSTRACT                                       kyoma-180@ep.sci.hokudai.ac.jp
                                                                            3 Alfred Wegener Institute for Polar and

                                                                            Marine Research Columbusstrasse, PO
  Based on revised and newly obtained age assignments, sediment ac-         Box 120161, 27515 Bremerhaven,
cumulation rates and sedimentation curves were recalculated and re-         Germany.
                                                                            4 Central Oregon College Science
drawn, respectively, for Ocean Drilling Program Sites 1109, 1115, and
1118.                                                                       Department, 2600 Northwest College
                                                                            Way, Bend OR 97702, USA.
                                                                            5 Dipartimento di Scienze della Terra,

                                                                            Università degli Studi di Genova, Corso
            REVISION OF AGE ASSIGNMENTS                                     Europa, 26, Genova 16132, Italy.
                                                                            6 School of Ocean and Earth Science

   Several planktonic foraminifer datum points were revised by Resig et     and Technology, University of Hawaii
al. (in press). Similarly, slight corrections for several magnetic chron    at Manoa, 2525 Correa Road, Honolulu
                                                                            HI 96822-2285, USA.
and subchron boundaries have also been made (G. Frost, pers. comm.,         7 School of Earth Sciences, Kyoto
2000). Moreover, Lackschewitz et al. (in press) measured 40Ar/39Ar ages     University, Sakyo-ku, Kyoto 606-8501,
for fallout tephra layers and volcaniclastic deposits in the sedimentary    Japan.
                                                                            8 Universität Bremen, FB 5
successions at Sites 1109, 1115, and 1118. Seismic correlation between
Sites 1109 and 1118 were made by Goodliffe et al. (this volume).            Geowissenschaften, Postfach 330440,
                                                                            28334 Bremen, Germany.
   The sedimentation rates were recalculated based on the revised and       9 Department of Geology, University of
newly obtained age assignments mentioned above at Sites 1109, 1115,         Papua New Guinea, Box 414,
and 1118 (Figs. F1, F2, F3, respectively). Based on these calculations,     University PO, Papua New Guinea.
                                                                            10 Department of Geology, Vanderbilt
sedimentation curves were correlated between sites (Fig. F4).
   Testa et al. (this volume) found several radiolarian datum levels from   University, Box 46 Station B, Nashville
                                                                            TN 37235, USA.
Holes 1108B, 1110A, 1111A, 1112A, and 1115B. Newly obtained maxi-
mum ages for select Quaternary samples from Sites 1108, 1110–1112,          Initial receipt: 20 October 2000
and 1115 are listed in Table T1. For each sample, the actual age may be     Acceptance: 30 March 2001
equal to or younger than the age of the radiolarian zone indicated.         Web publication: 8 August 2002
                                                                            Ms 180SR-152
K. TAKAHASHI ET AL.
REVISED AGE ASSIGNMENTS                                                                                                                                                                                                                                                                                                                                                                                          2

 F1. Age-depth relationship, Site                                                                                                                                                                      F4. Sedimentation curves, p. 10.
 1109, p. 4.                                                                                                                                                                                                                                            0         1          2        3         4          5      6
                                                                                                                                                                                                                                                                                                                             Age (Ma)
                                                                                                                                                                                                                                                                                                                             7     8    9   10      11     12            13         14           15
                                                                                                                                                                                                                                                    0
                                                                                                                                                                                                                                                                                                                                                                0             1            2          3
                                                                                                                                                                                                                                                                                                                                                            0
                                                                                              Age (Ma)                                                            Paleobathymetry (m)                                                                                                                                                                                                          >70    Site
                                                                                                                                                                                                                                                                                                                                                                        15




                                                                                                                                                                                                2000
                                                                                                                                                                  150
                                                                                                                                                                  500
                                                                                                                                                                    0
                                                                                                                                                                                                                                                                                                                                                           50                                         1116
                                       0                     1                       2                       3                        4                 5                                                                                         100                                                                                                                         138
                                            1
                                   0            34 5                                                                                                                                                                                                                                                                                                      100                                  >176
                                            2                 9                                                                                                                                                                                                                                                                                                                   324
                                                    6 7 8                      ~48 m/m.y.
                                                          1011 12                                                                                                                                                                                                                                                                                         150                                         Site
                                                             13
                                                                                                                                                                                                                                                  200
                                                              14
                                                                                                                                                                                                                                                                                                                                                                                                      1114
                               100                                                                                                                                                                                                                                                                                                                        200
                                                                                                                                                                                   Middle
                                                                                     ~216 m/m.y.                                                                                   bathyal                                                                                                                                                                250                 Site 1108
                                                                                                                                                                                                                                                  300
                               200
                                                                           15 16




                                                                                                                                                                                                                                   Depth (mbsf)
                                                                                                                                                                                                                                                                                                                                                          300

                                                                                1718               21                                                                                                                                                                                                                                                     350                                  400
                                                                                         19             22 ~69        m/m.y.                                                                                                                      400
                               300
                Depth (mbsf)




                                                                                              20                 23                                                                                                                                                                                                                                       400
                                                                                                         24
                                                                                                              25
                                                                                                               26      27                                                                                                                                                                                                                                 450
                                                                                                                                                                                                                                                  500
                               400                                                                                         ~297 m/m.y.
                                                                                                                      28                                                 Upper
                                                                                                                             29
                                                                                                                                            ~229 m/m.y.                  bathyal
                                                                                                                      30
                               500                                                                                                                                                                                                                600

                                                                                                                                31                                                                                                                                                                                                                  Site 1115
                                                                                                                                     33
                                                                                                                                    34 ~98         m/m.y.
                                                                                                                                 32
                               600                                                                                                   35
                                                                                                                                                   >74 m/m.y.                                                                                     700             Site 1118
                                                                                                                                                                         Outer
                                                    Datum events                         Hole Depth (mbsf)                         Age (Ma)                              neritic                                                                                                                          Site 1109
                                                                                                                                                        36
                                                                                                                                                                      Inner
                               700            1 LAD G. ruber (pink)    C                           2.43 - 5.39                         0.12                           neritic
                                              2 FAD B. calida          C                           17.29 - 26.74                       0.22                                                                                                       800
                                              3 FAD E. huxleyi         C                           17.29 - 17.85                       0.26




                                                                                                                                                                                                                   Sedimentation
                                              4 40Ar/39Ar              C                           26.26 - 26.28                       0.43 ± 0.02




                                                                                                                                                                                                        bathymetry rate (m/m.y.)
                                              5 40Ar/39Ar              C                           26.51 - 25.53                       0.48 ± 0.04




                                                                                                                                                                                                                                                                                                                                                                                    >376
                                              6 LAD P. lacunosa        C                           29.58 - 31.95                       0.46                                                                                                                 44        63         79       296         61                    >13              (<5)
                                              7 LAD G. tosaensis       C                           32.50 - 32.62                       0.65                                                                                        Site 1115
                                              8 Brunhes/Matuyama       C                           36                                  0.78                                                                                        Site 1109                48        216        69       297       >80                     >13
                                              9 FAD G. omega           C                           36.42 - 36.85                       1.02
                                            *10 Top Jaramillo          C                           47.5 - 48.0                         0.99                                                                                        Site 1118                 49        317   155 436 479
                                             11 Bottom Jaramillo       C                           53.5 - 54.0                         1.07                                                                                                                  Middle bathyal      U. bathyal Outer                   Inner neritic                                   Outer neritic
                                             12 40Ar/39Ar              C                           62.9 - 62.92                        1.21 ± 0.16                                                                                 Site 1115                 (500-2000 m)       (150-500 m) neritic                   (0-50 m)                                      (50-150 m)
                                             13 Top Cobb               C                           70.5                                1.201                                                                                                                 Middle bathyal      Upper bathyal Outer             Inner neritic




                                                                                                                                                                                                        Paleo-
                                                                                                                                                                                                                                   Site 1109                 (500-2000 m)         (150-500 m) neritic              (0-50 m)                                               Upper bathyal         Middle bathyal
                                             14 Bottom Cobb            C                           74                                  1.211                                                                                                                                                                                                                              (150-500 m)
                                                                                                                                                                                                                                                                         Middle Upper         Neritic
                                             15 LAD G. fistulosus      C                           199.87 - 208.51                     1.6                                                                                         Site 1118                             bathyal bathyal    (0-150 m)
                                             16 Top Olduvai            C                           213                                 1.77
                                            *17 Bottom Olduvai         C                           255                                 1.95
                                             18 Top Reunion            C                           266                                 2.14
                                             19 Bottom Reunion         C                           269                                 2.15
                                             20 LAD D. surculus        C                           294.81 - 304.36                     2.55
                                             21 Matuyama/Gauss         C                           291                                 2.58
                                             22 FAD G. truncatulinoidesC                           295.75 - 297.23                     2.7
                                            *23 LAD D. altispira       C                           330.85 - 333.83                     3.09
                                            *24 Top Kaena              C                           331                                 3.04
                                             25 Top Mammoth            C                           355                                 3.22
                                                                       D                           358                                 3.22
                                             26 40Ar/39Ar              D                           371.6 - 372.2                       3.27 ± 0.03
                                             27 Bottom Mammoth         D                           384.5                               3.33
                                             28 LAD G. margaritae
                                             29 Gauss/Gilbert
                                             30 40Ar/39Ar
                                            *31 FAD G. crassaformis
                                                                       D
                                                                       D
                                                                       D
                                                                       D
                                                                                                   442.08 -
                                                                                                   470
                                                                                                           444.49

                                                                                                   471.5 - 471.9
                                                                                                   548.80 - 551.00
                                                                                                                                       3.50
                                                                                                                                       3.58
                                                                                                                                       3.49 ± 0.09
                                                                                                                                       3.8
                                                                                                                                                                                                       T1. Maximum possible ages based
                                             32 LCO R. pseudoumbilicus D                           562.51 - 562.71                     3.94
                                             33 S/D Pulleniatina
                                             34 FCO D. asymmetricus
                                            *35 Top C3n
                                            *36 FAD C. rugosus
                                                                       D
                                                                       D
                                                                       D
                                                                       D
                                                                                                   562.71 - 566.55
                                                                                                   571.66 - 578.42
                                                                                                   587
                                                                                                   >664.29
                                                                                                                                       3.95
                                                                                                                                       4.13
                                                                                                                                       4.18
                                                                                                                                       5.23
                                                                                                                                                                                                       on radiolarians, p. 12.
                                            * datum level used in sedimentation rate calculation
                                            Revised and newly obtained age assignments are expressed in bold.




 F2. Age-depth relationship, Site
 1115, p. 6.
                                                                                              Age (Ma)                                                      Paleobathymetry (m)
                                                                                                                                                               0




                                                                                                                                                                                         1150
                                                                                                                                                              50
                                                                                                                                                             150

                                                                                                                                                                         500




                                       0                2          4                 6             8                  10              12           14
                                       21
                                   0
                                       34 78 ~44 m/m.y.
                                        56 9                                                                                                                                   Upper
                                          10 1213 ~63 m/m.y.
                                           11 14           ~63 m/m.y.                                                                                                          middle
                               100          15 17  18                                                                                                                          bathyal
                                             16 19
                                                    2021 ~79 m/m.y.
                                                23    22
                                               24 25 26
                               200                 27 28

                                                            29                                                                                                      Upper
                                                                           ~296 m/m.y.                                                                              bathyal
                               300
             Depth (mbsf)




                                                                     30
                                                                31
                               400                               32 34          ~61 m/m.y.
                                                                  33           35
                                                                                                                                                                    Outer
                                                                                              >13 m/m.y.                                                            neritic
                               500                                                                                         (<5 m/m.y.)                            Inner
                                                                                36                      37                                                        neritic
                                                                                                                                                                    Outer
                                                                                                                                       38
                               600                                                                                                            39
                                                                                                                                                                    neritic
                                                    Datum event                          Depth (mbsf)                  Age (Ma)                                     Upper
                                             1 LAD G. ruber (pink)                           2.45 - 5.44        0.12           >376                                 bathyal
                               700           2 40Ar/39Ar                                     3.96 - 3.98        0.135 ± 0.008 m/m.y.                                      Upper
                                             3 FAD B. calida                                 7.11 - 17.20       0.22        40
                                                                                                                                                                          middle
                                             4 LAD P. lacunosa                               14.16 - 17.20      0.46                                                      bathyal
                                               FAD A. ypsilon **                             18.8<          Pleistocene        41
                                                                                                                                  42
                               800           5 LAD G. tosaensis                              31.65 - 33.15      0.65
                                             6 Brunhes/Matuyama                              33.5 - 36          0.78
                                            *7 Top Jaramillo                                 43.5               0.99
                                             8 Bottom Jaramillo                              47                 1.07
                                             9 Top Cobb                                      53                 1.201
                                            10 Bottom Cobb                                   54.5               1.211
                                            11 LAD G. fistulosus                             86.65 - 88.35      1.6
                                            11 LAD C. macintyrei                             82.15 - 82.80      1.67
                                            13 40Ar/39Ar                                     88.30 - 88.32      1.71 ± 0.06
                                            14 Top Olduvai                                   90.5               1.77
                                           *15 Bottom Olduvai                                102.5 - 103.5      1.95
                                           *16 LAD D. brouweri                               103.16 - 106.16    1.95
                                            17 Top Reunion                                   118                2.14
                                            18 Bottom Reunion                                119.5              2.15
                                            19 LAD D. pentaradiatus                          144.13 - 147.15    2.52
                                            20 Matuyama/Gauss                                162                2.581
                                            21 FAD G. truncatulinoides                       166.15 - 169.16    2.7
                                            22 40Ar/39Ar                                     169.3 - 169.32     2.77 ± 0.04
                                            23 LAD D. surculus                               175.65 - 178.63    2.55
                                            24 LAD D. tamalis                                178.63 - 188.15    2.83
                                            25 40Ar/39Ar                                     189.62 - 189.64    2.84 ± 0.03
                                           *26 LAD D. altispira                              190.15 - 193.15    3.09
                                           *27 Top Kaena                                     192.50             3.04
                                            28 Bottom Kaena                                  202                3.11
                                            29 40Ar/39Ar                                     243.42 - 243.44    3.23 ± 0.08
                                            30 40Ar/39Ar                                     367.9 - 368.6      3.78 ± 0.16
                                            31 Gauss/Gilbert                                 386.00 - 387.00    3.58
                                           *32 FAD G. crassaformis                           407.31 - 412.07    3.8
                                            33 LCO R. pseudoumbilicus                        428.65 - 439.01    3.94
                                            34 S/D Pulleniatina                              412.07 - 425.81    3.95
                                            35 FAD C. rugosus                                456.04<            5.23
                                           *36 LAD D. quinqueramus                           514.29 - 516.37    5.54
                                           *37 FAD D. quinqueramus                           555.29<            8.6
                                           *38 LAD G. praemenardii                           <572.27          >12.1
                                           *39 LAD S. heteromorphus                          <600.11           13.6
                                            40 40Ar/39Ar                                     709.7 - 712.9     13.84 ± 0.02
                                           *41 40Ar/39Ar                                     765.4 - 771.8     14.04 ± 0.03
                                            42 FAD O. suturalis                              802.14<           15.1
                                       * datum level used in sedimentation rate calculation
                                       Revised and newly obtained age assignments are expressed in bold.
                                       ** specimen with pecularities pointed out by Nigrini (1971)




 F3. Age-depth relationship, Site
 1118, p. 8.
                                                                                             Age (Ma)                                                             Paleobathymetry (m)
                                                                                                                                                                   150
                                                                                                                                                                            500
                                                                                                                                                                     0




                                                                                                                                                                                                2000




                                       1                                       2                                            3                                 4
                               0
                                           ~49 m/m.y.
                                                1
                                                    2
                    100
                                                                       ~317 m/m.y.

                    200                                     3          4


                                                                           5                            ~155 m/m.y.                                                                Middle
                    300                                                              6                                                                                             bathyal
     Depth (mbsf)




                                                                                         7
                                                                                                        8
                                                                                                         9
                                                                                                          10
                    400
                                                                                                                 11         ~436 m/m.y.
                    500
                                                                                                                 12
                                                                                                                            13
                    600                                                                                                           14                                        Upper
                                                                                                                                  15
                                                                                                                                                                            bathyal
                                                                                                                                       16
                    700                                                                                                                            ~479 m/m.y.
                                                                                                                                 17
                                                                                                                                       18
                    800
                                                                                                                                             19     20 22 21
                                                                                                                                                      23
                                                    Datum event                              Depth (mbsf) Age (Ma)
                                            *1 seismic layer 79 ms                           60.83                              1.23
                                                (= Site 1109 102 ms)                                                             (Site 1109 79.63 mbsf)
                                             2 seismic layer 113 ms                          87.53                              1.32
                                                (= Site 1109 130 ms)                                                             (Site 1109 102.08 mbsf)
                                             3 LAD G. fistulosus                             <205.00                            1.6
                                             4 Top Olduvai                                   210.42                             1.77
                                            *5 Bottom Olduvai                                288.0                              1.95
                                             6 Top Reunion                                   332.0                              2.14
                                             7 Bottom Reunion                                334.5                              2.15
                                             8 LAD D. pentaradiatus                          339.87 - 348.87                    2.52
                                            *9 LAD D. surculus                               374.47 - 384.20                    2.55
                                           *10 Matuyama/Gauss                                387.5                              2.581
                                            11 FAD G. truncatulinoides                       449.93 - 456.85                    2.7
                                            12 LAD D. tamalis                                549.75 - 556.95                    2.83
                                           *13 Top Kaena                                     599.0                              3.04
                                           *14 LAD D. altispira                              597.72 - 608.20                    3.09
                                            15 Bottom Kaena                                  623.0                              3.11
                                            16 Top Mammoth                                   662.5                              3.22
                                            17 40Ar/39Ar                                     734.9 - 737.7                      3.21 ± 0.08
                                            18 Bottom Mammoth                                744.5                              3.33
                                            19 LAD G. margaritae                             835.32 - 840.54                    3.5
                                           *20 Gauss/Gilbert                                 846.0 - 849.5                      3.58
                                            21 LCO R. pseudoumbilicus                        >853.15                            3.94
                                            22 FAD G. crassaformis                           >849.30                            3.8
                                            23 40Ar/39Ar                                     850.7 - 855.0                      3.79 ± 0.01
                                           * datum level used in sedimentation rate calculation
                                           Revised and newly obtained age assignments are expressed in bold.
K. TAKAHASHI ET AL.
REVISED AGE ASSIGNMENTS                                                                              3

                                           REFERENCES
        Caulet, J.-P., Nigrini, C., and Schneider, D.A., 1993. High resolution Pliocene-Pleis-
          tocene radiolarian stratigraphy of the tropical Indian Ocean. Mar. Micropaleontol.,
          22:111–129.
        Johnson, D.A., Schneider, D.A., Nigrini, C.A., Caulet, J.-P., and Kent, D.V., 1989.
          Pliocene-Pleistocene radiolarian events and magnetostratigraphic calibrations for
          the tropical Indian Ocean. Mar. Micropaleontol., 14:33–66.
        Lackschewitz, K.S., Bogaard, P.V.D., Mertz, D.F., in press. 40Ar/39Ar ages of fallout
          tephra layers and volcaniclastic deposits in the sedimentary succession of the west-
          ern Woodlark Basin, Papua New Guinea: The marine record of Miocene-Pleis-
          tocene volcanism. In Wilson, R.C.L., Whitmarsh, R.B., Taylor, B., and Froitzheim,
          N. (Eds.), Non-volcanic Rifting of Continental Margins: Evidence from Land and Sea,
          Geol. Soc. Spec. Publ. (London). [N1]
        Nigrini, C., 1971. Radiolarian zones in the Quaternary of the equatorial Pacific
          Ocean. In Funnell, B.M., and Riedel, W.R. (Eds.), The Micropalaeontology of Oceans:
          Cambridge (Cambridge Univ. Press), 443–461.
        Resig, J.M., Frost, G.M., Ishikawa, N., Perembo, R.C.B., in press. Micropaleontologic
          and paleomagnetic approaches to stratigraphic anomalies in rift basins: ODP Site
          1109, Woodlark Basin. In Wilson, R.C.L., Whitmarsh, R.B., Taylor, B., and
          Froitzheim, N. (Eds.), Non-volcanic Rifting of Continental Margins: Evidence from Land
          and Sea, Geol. Soc. Spec. Publ. (London). [N2]
        Sanfilippo, A., and Nigrini, C., 1998. Code numbers for Cenozoic low latitude radi-
          olarian biostratigraphic zones and GPTS conversion tables. Mar. Micropaleontol.,
          33:109–156.
        Shackleton, N.J., Baldauf, J.G., Flores, J.-A., Iwai, M., Moore, T.C., Jr., Raffi, I., and
          Vincent, E., 1995. Biostratigraphic summary for Leg 138. In Pisias, N.G., Mayer,
          L.A., Janecek, T.R., Palmer-Julson, A., and van Andel, T.H. (Eds.), Proc. ODP, Sci.
          Results, 138: College Station, TX (Ocean Drilling Program), 517–536.
        Shipboard Scientific Party, 1999a. Leg 180 summary. In Taylor, B., Huchon, P., Klaus,
          A., et al., Proc. ODP, Init. Repts., 180, 1–77 [CD-ROM]. Available from: Ocean Drill-
          ing Program, Texas A&M University, College Station, TX 77845-9547, U.S.A.
        ————, 1999b. Site 1109. In Taylor, B., Huchon, P., Klaus, A., et al., Proc. ODP, Init.
          Repts., 180, 1–298 [CD-ROM]. Available from: Ocean Drilling Program, Texas A&M
          University, College Station, TX 77845-9547, U.S.A.
        ————, 1999c. Site 1115. In Taylor, B., Huchon, P., Klaus, A., et al., Proc. ODP, Init.
          Repts., 180, 1–226 [CD-ROM]. Available from: Ocean Drilling Program, Texas A&M
          University, College Station, TX 77845-9547, U.S.A.
        ————, 1999d. Site 1118. In Taylor, B., Huchon, P., Klaus, A., et al., Proc. ODP, Init.
          Repts., 180, 1–213 [CD-ROM]. Available from: Ocean Drilling Program, Texas A&M
          University, College Station, TX 77845-9547, U.S.A.
K. TAKAHASHI ET AL.
REVISED AGE ASSIGNMENTS                                                                                  4

Figure F1. Age-depth relationship at Site 1109 based on nannofossil (squares) and planktonic foraminiferal
(circles) datum levels, 40Ar/39Ar age (crosses), and magnetic chron and subchron boundaries (triangles), as
a revision of fig. F63 in Shipboard Scientific Party (1999b) and paleobathymetry (right column) based on
benthic foraminifers. Sediment accumulation rates are estimated in meters per million years. Revised and
newly obtained age assignments are shown by red symbols. The numbers plotted near symbols correspond
to numbers in the left column of the datum table. LAD = last appearance datum, FAD = first appearance
datum, LCO = last common occurrence, FCO = first common occurrence, S/D = sinistral to dextral coiling
change. (Figure shown on next page.)
K. TAKAHASHI ET AL.
REVISED AGE ASSIGNMENTS                                                                                                                         5

Figure F1 (continued).
                                                            Age (Ma)                                                 Paleobathymetry (m)




                                                                                                                                         2000
                                                                                                                     150
                                                                                                                     500
                                                                                                                       0
                     0              1             2                     3                    4              5
                         1
                 0           34 5
                         2             9
                             6 7 8            ~48 m/m.y.
                                   1011 12
                                      13
               100                     14

                                                                                                                               Middle
                                                     ~216 m/m.y.                                                               bathyal
               200
                                             15 16

                                                1718             21
                                                       19             22 ~69     m/m.y.
               300
Depth (mbsf)




                                                            20              23
                                                                      24
                                                                           25
                                                                            26    27
               400                                                                    ~297 m/m.y.
                                                                                 28                                      Upper
                                                                                        29
                                                                                                 ~229 m/m.y.             bathyal
                                                                                 30
               500
                                                                                        31
                                                                                             33
                                                                                            34 ~98   m/m.y.
                                                                                         32
               600                                                                           35
                                                                                                        >74 m/m.y.        Outer
                              Datum events             Hole Depth (mbsf)                     Age (Ma)                     neritic
                                                                                                            36
                                                                                                                       Inner
               700         1 LAD G. ruber (pink)    C            2.43 - 5.39                  0.12                     neritic
                           2 FAD B. calida          C            17.29 - 26.74                0.22
                           3 FAD E. huxleyi         C            17.29 - 17.85                0.26
                           4 40Ar/39Ar              C            26.26 - 26.28                0.43 ± 0.02
                           5 40Ar/39Ar              C            26.51 - 25.53                0.48 ± 0.04
                           6 LAD P. lacunosa        C            29.58 - 31.95                0.46
                           7 LAD G. tosaensis       C            32.50 - 32.62                0.65
                           8 Brunhes/Matuyama       C            36                           0.78
                           9 FAD G. omega           C            36.42 - 36.85                1.02
                         *10 Top Jaramillo          C            47.5 - 48.0                  0.99
                          11 Bottom Jaramillo       C            53.5 - 54.0                  1.07
                          12 40Ar/39Ar              C            62.9 - 62.92                 1.21 ± 0.16
                          13 Top Cobb               C            70.5                         1.201
                          14 Bottom Cobb            C            74                           1.211
                          15 LAD G. fistulosus      C            199.87 - 208.51              1.6
                          16 Top Olduvai            C            213                          1.77
                         *17 Bottom Olduvai         C            255                          1.95
                          18 Top Reunion            C            266                          2.14
                          19 Bottom Reunion         C            269                          2.15
                          20 LAD D. surculus        C            294.81 - 304.36              2.55
                          21 Matuyama/Gauss         C            291                          2.58
                          22 FAD G. truncatulinoidesC            295.75 - 297.23              2.7
                         *23 LAD D. altispira       C            330.85 - 333.83              3.09
                         *24 Top Kaena              C            331                          3.04
                          25 Top Mammoth            C            355                          3.22
                                                    D            358                          3.22
                          26 40Ar/39Ar              D            371.6 - 372.2                3.27 ± 0.03
                          27 Bottom Mammoth         D            384.5                        3.33
                          28 LAD G. margaritae      D            442.08 -444.49               3.50
                          29 Gauss/Gilbert          D            470                          3.58
                          30 40Ar/39Ar              D            471.5 - 471.9                3.49 ± 0.09
                         *31 FAD G. crassaformis    D            548.80 - 551.00              3.8
                          32 LCO R. pseudoumbilicus D            562.51 - 562.71              3.94
                          33 S/D Pulleniatina       D            562.71 - 566.55              3.95
                          34 FCO D. asymmetricus    D            571.66 - 578.42              4.13
                         *35 Top C3n                D            587                          4.18
                         *36 FAD C. rugosus         D            >664.29                      5.23
                         * datum level used in sedimentation rate calculation
                         Revised and newly obtained age assignments are expressed in bold.
K. TAKAHASHI ET AL.
REVISED AGE ASSIGNMENTS                                                                                  6

Figure F2. Age-depth relationship at Site 1115 based on nannofossil (squares) and planktonic foraminiferal
(circles) datum levels, 40Ar/39Ar age (crosses), and magnetic chron and subchron boundaries (triangles), as
a revision of fig. F37 in Shipboard Scientific Party (1999c) and paleobathymetry (right column) based on
benthic foraminifers. Sediment accumulation rates are estimated in meters per million years. Revised and
newly obtained age assignments are shown by red symbols. The numbers plotted near symbols correspond
to numbers in the left column of the datum table. LAD = last appearance datum, FAD = first appearance
datum, LCO = last common occurrence, S/D = sinistral to dextral coiling change. (Figure shown on next
page.)
K. TAKAHASHI ET AL.
REVISED AGE ASSIGNMENTS                                                                                                                 7

Figure F2 (continued).

                                                             Age (Ma)                                  Paleobathymetry (m)




                                                                                                          0




                                                                                                                                 1150
                                                                                                        150

                                                                                                                 500
                                                                                                         50
                     0            2        4           6        8         10        12            14
                     21
                0
                     34 78 ~44 m/m.y.
                      56 9                                                                                             Upper
                        10 1213 ~63 m/m.y.
                         11 14           ~63 m/m.y.                                                                    middle
               100        15 17  18                                                                                    bathyal
                           16 19
                                  2021 ~79 m/m.y.
                              23    22
                             24 25 26
               200               27 28

                                      29                                                                     Upper
                                               ~296 m/m.y.                                                   bathyal
               300
Depth (mbsf)




                                            30
                                       31
               400                      32 34     ~61 m/m.y.
                                         33      35
                                                                                                             Outer
                                                             >13 m/m.y.                                      neritic
               500                                                             (<5 m/m.y.)                 Inner
                                                  36                37                                     neritic
                                                                                                             Outer
                                                                                     38
               600                                                                           39
                                                                                                             neritic
                               Datum event                 Depth (mbsf)    Age (Ma)                          Upper
                          1    LAD G. ruber (pink)          2.45 - 5.44        0.12           >376           bathyal
               700        2    40Ar/39Ar                    3.96 - 3.98        0.135 ± 0.008 m/m.y.                Upper
                          3    FAD B. calida                7.11 - 17.20       0.22        40
                                                                                                                   middle
                          4    LAD P. lacunosa              14.16 - 17.20      0.46                                bathyal
                               FAD A. ypsilon **            18.8<          Pleistocene        41
                                                                                                 42
               800         5   LAD G. tosaensis             31.65 - 33.15      0.65
                           6   Brunhes/Matuyama             33.5 - 36          0.78
                          *7   Top Jaramillo                43.5               0.99
                           8   Bottom Jaramillo             47                 1.07
                           9   Top Cobb                     53                 1.201
                          10   Bottom Cobb                  54.5               1.211
                          11   LAD G. fistulosus            86.65 - 88.35      1.6
                          11   LAD C. macintyrei            82.15 - 82.80      1.67
                          13   40Ar/39Ar                    88.30 - 88.32      1.71 ± 0.06
                          14   Top Olduvai                  90.5               1.77
                         *15   Bottom Olduvai               102.5 - 103.5      1.95
                         *16   LAD D. brouweri              103.16 - 106.16    1.95
                          17   Top Reunion                  118                2.14
                          18   Bottom Reunion               119.5              2.15
                          19   LAD D. pentaradiatus         144.13 - 147.15    2.52
                          20   Matuyama/Gauss               162                2.581
                          21   FAD G. truncatulinoides      166.15 - 169.16    2.7
                          22   40Ar/39Ar                    169.3 - 169.32     2.77 ± 0.04
                          23   LAD D. surculus              175.65 - 178.63    2.55
                          24   LAD D. tamalis               178.63 - 188.15    2.83
                          25   40Ar/39Ar                    189.62 - 189.64    2.84 ± 0.03
                         *26   LAD D. altispira             190.15 - 193.15    3.09
                         *27   Top Kaena                    192.50             3.04
                          28   Bottom Kaena                 202                3.11
                          29   40Ar/39Ar                    243.42 - 243.44    3.23 ± 0.08
                          30   40Ar/39Ar                    367.9 - 368.6      3.78 ± 0.16
                          31   Gauss/Gilbert                386.00 - 387.00    3.58
                         *32   FAD G. crassaformis          407.31 - 412.07    3.8
                          33   LCO R. pseudoumbilicus       428.65 - 439.01    3.94
                          34   S/D Pulleniatina             412.07 - 425.81    3.95
                          35   FAD C. rugosus               456.04<            5.23
                         *36   LAD D. quinqueramus          514.29 - 516.37    5.54
                         *37   FAD D. quinqueramus          555.29<            8.6
                         *38   LAD G. praemenardii          <572.27          >12.1
                         *39   LAD S. heteromorphus         <600.11           13.6
                          40   40Ar/39Ar                    709.7 - 712.9     13.84 ± 0.02
                         *41   40Ar/39Ar                    765.4 - 771.8     14.04 ± 0.03
                          42   FAD O. suturalis             802.14<           15.1
                     * datum level used in sedimentation rate calculation
                     Revised and newly obtained age assignments are expressed in bold.
                     ** specimen with pecularities pointed out by Nigrini (1971)
K. TAKAHASHI ET AL.
REVISED AGE ASSIGNMENTS                                                                                     8

Figure F3. Age-depth relationship at Site 1118 based on nannofossil (squares) and planktonic foraminiferal
(circles) datum levels, 40Ar/39Ar age (crosses), magnetic chron and subchron boundaries (triangles), and seis-
mic correlation with Site 1109 (pluses), as a revision of fig. F54 in Shipboard Scientific Party (1999d) and
paleobathymetry (right column) based on benthic foraminifers. Sediment accumulation rates are estimated
in meters per million years. Revised and newly obtained age assignments are shown by red symbols. The
numbers plotted near the symbols correspond to numbers in the left column of the datum table. LAD = last
appearance datum, FAD = first appearance datum, LCO = last common occurrence. (Figure shown on next
page.)
K. TAKAHASHI ET AL.
REVISED AGE ASSIGNMENTS                                                                                                                          9

Figure F3 (continued).
                                                              Age (Ma)                                              Paleobathymetry (m)




                                                                                                                    150
                                                                                                                          500
                                                                                                                      0




                                                                                                                                          2000
                     1                            2                               3                           4
                0
                         ~49 m/m.y.
                           1
                               2
               100
                                          ~317 m/m.y.

               200                  3     4


                                              5                       ~155 m/m.y.                                               Middle
               300                                    6                                                                         bathyal
Depth (mbsf)




                                                          7
                                                                      8
                                                                       9
                                                                        10
               400
                                                                             11   ~436 m/m.y.
               500
                                                                             12
                                                                                  13
               600                                                                     14                                 Upper
                                                                                       15
                                                                                                                          bathyal
                                                                                            16
               700                                                                                    ~479 m/m.y.
                                                                                       17
                                                                                            18
               800
                                                                                                 19   20 22 21
                                                                                                        23
                               Datum event                    Depth (mbsf) Age (Ma)
                          *1 seismic layer 79 ms              60.83                   1.23
                              (= Site 1109 102 ms)                                     (Site 1109 79.63 mbsf)
                           2 seismic layer 113 ms             87.53                   1.32
                              (= Site 1109 130 ms)                                     (Site 1109 102.08 mbsf)
                           3 LAD G. fistulosus                <205.00                 1.6
                           4 Top Olduvai                      210.42                  1.77
                          *5 Bottom Olduvai                   288.0                   1.95
                           6 Top Reunion                      332.0                   2.14
                           7 Bottom Reunion                   334.5                   2.15
                           8 LAD D. pentaradiatus             339.87 - 348.87         2.52
                          *9 LAD D. surculus                  374.47 - 384.20         2.55
                         *10 Matuyama/Gauss                   387.5                   2.581
                          11 FAD G. truncatulinoides          449.93 - 456.85         2.7
                          12 LAD D. tamalis                   549.75 - 556.95         2.83
                         *13 Top Kaena                        599.0                   3.04
                         *14 LAD D. altispira                 597.72 - 608.20         3.09
                          15 Bottom Kaena                     623.0                   3.11
                          16 Top Mammoth                      662.5                   3.22
                          17 40Ar/39Ar                        734.9 - 737.7           3.21 ± 0.08
                          18 Bottom Mammoth                   744.5                   3.33
                          19 LAD G. margaritae                835.32 - 840.54         3.5
                         *20 Gauss/Gilbert                    846.0 - 849.5           3.58
                          21 LCO R. pseudoumbilicus           >853.15                 3.94
                          22 FAD G. crassaformis              >849.30                 3.8
                          23 40Ar/39Ar                        850.7 - 855.0           3.79 ± 0.01
                         * datum level used in sedimentation rate calculation
                         Revised and newly obtained age assignments are expressed in bold.
K. TAKAHASHI ET AL.
REVISED AGE ASSIGNMENTS                                                                                     10

Figure F4. Sedimentation curves at Sites 1115 (black line), 1109 (red line), 1118 (green line), 1108 (solid
line, upper right), 1114 (dashed line, upper right), and 1116 (dotted line, upper right) based on nannofossil
(squares), planktonic foraminifer (circles), and radiolarian (diamonds) datum levels, magnetic chron and
subchron boundaries (triangles), 40Ar/39Ar age (crosses), seismic correlation (pluses), and lithostratigraphic
correlation (stars), as a revision of fig. F10 in Shipboard Scientific Party (1999a). Symbols with arrows indi-
cate that the actual datum points can be above or below and older or younger than indicated by the sym-
bols. Wavy lines denote unconformities. Shown below are average sedimentation rates in meters per mil-
lion years calculated for intervals separated by vertical lines and paleobathymetry based on benthic fora-
minifers at Sites 1115, 1109, and 1118. Broken lines indicate uncertainty in the placement of paleodepth
boundaries. (Figure shown on next page.)
Figure F4 (continued).




                                                                                                                                                                                                         REVISED AGE ASSIGNMENTS
                                                                                                                                                                                                         K. TAKAHASHI ET AL.
                                                                                                                     Age (Ma)
                                                0         1          2        3         4          5      6          7     8    9   10      11     12            13         14           15
                                            0
                                                                                                                                                        0             1            2          3
                                                                                                                                                    0
                                                                                                                                                                                       >70    Site
                                                                                                                                                   50           15
                                          100                                                                                                                                                 1116
                                                                                                                                                                      138
                                                                                                                                                  100                                  >176
                                                                                                                                                                          324
                                                                                                                                                  150                                         Site
                                          200
                                                                                                                                                                                              1114
                                                                                                                                                  200

                                                                                                                                                  250                 Site 1108
                                          300
                           Depth (mbsf)




                                                                                                                                                  300

                                                                                                                                                  350                                  400
                                          400
                                                                                                                                                  400

                                                                                                                                                  450
                                          500



                                          600
                                                                                                                                            Site 1115

                                          700             Site 1118
                                                                                                  Site 1109

                                          800
           Sedimentation
bathymetry rate (m/m.y.)




                                                                                                                                                                            >376
                           Site 1115                44        63         79       296         61                    >13              (<5)

                           Site 1109                48        216        69       297       >80                     >13

                           Site 1118                 49        317   155 436 479
                                                     Middle bathyal      U. bathyal Outer                   Inner neritic                                   Outer neritic
                           Site 1115                 (500-2000 m)       (150-500 m) neritic                   (0-50 m)                                      (50-150 m)
                                                     Middle bathyal      Upper bathyal Outer             Inner neritic
Paleo-




                           Site 1109                 (500-2000 m)         (150-500 m) neritic              (0-50 m)                                               Upper bathyal         Middle bathyal
                                                                 Middle Upper         Neritic                                                                     (150-500 m)
                           Site 1118                             bathyal bathyal    (0-150 m)




                                                                                                                                                                                                         11
Table T1. Maximum possible ages of select samples from Sites 1108, 1110, 1111, 1112, and 1115 based on radiolarians.




                                                                                                                                                                                                                                                                                                                                                                                                                                     REVISED AGE ASSIGNMENTS
                                                                                                                                                                                                                                                                                                                                                                                                                                     K. TAKAHASHI ET AL.
                                                                      Basal Zone                                                                                                                                                                                 Sample
                                                                       Age (Ma)




                                                                                                                                                                                                                                                                                                                                       1112A-1R-1, 100-101 cm



                                                                                                                                                                                                                                                                                                                                                                                     1115B-2H-4, 145-147 cm
                                                                                                                (Shackleton et al., 1995)




                                                                                                                                                                                                                 1111A-11R-1, 44-46 cm

                                                                                                                                                                                                                                         1111A-14R-1, 60-62 cm

                                                                                                                                                                                                                                                                 1111A-14R-3, 62-64 cm

                                                                                                                                                                                                                                                                                         1111A-15R-1, 38-40 cm
                                                                                                                                            1108B-1R-1, 10-12 cm

                                                                                                                                                                   1110A-1H-2, 77-79 cm

                                                                                                                                                                                          1110A-2H-1, 58-62 cm




                                                                                                                                                                                                                                                                                                                                                                                                              1115B 3H-2, 58-60 cm
                                                               (Johnson et al., 1989)




                                                                                                                                                                                                                                                                                                                 1111A-16R-1, 5-7 cm



                                                                                                                                                                                                                                                                                                                                                                1115B-1H-1, 5-7 cm
                                                                                        (Caulet et al., 1993)
          Biozones (Sanfilippo and Nigrini, 1998)
RN 17 - Buccinosphaera invaginata Taxon-Range Zone       0.18
RN 16 - Collosphaera tuberosa      Interval Zone              0.42 0.42
RN 15 - Stylatractus universus     Concurrent Range Zone      0.47 0.61                                                                      x                     x                      x                      x                       x                       x                                                                                              x
RN 14 - Amphyropalum ypsilon       Interval Zone              1.10 1.12
RN 13 - Anthocyrtidium angulare Interval Zone                 1.65 1.74                                                                                                                                                                                                                  x                       x                     x                                             x                        x




                                                                                                                                                                                                                                                                                                                                                                                                                                     12
K. TAKAHASHI ET AL.
REVISED AGE ASSIGNMENTS                                                                                   13

                                                CHAPTER NOTES*
              N1. 19 February 2002—Lackschewitz, K., Bogaard, P.V.D., and Mertz, D.F., 2001. 40Ar/
                  39Ar ages of fallout tephra layers and volcaniclastic deposits in the sedimentary

                  succession of the western Woodlark Basin, Papua New Guinea: the marine record
                  of Miocene–Pleistocene volcanism. In Wilson, R.C.L., Whitmarsh, R.B., Taylor, B.,
                  and Froitzheim, N. (Eds.), Non-volcanic Rifting of Continental Margins: Evidence
                  from Land and Sea, Spec. Publ.—Geol. Soc. London, 187:373–388.
              N2. 19 February 2002—Resig, J.M., Frost, G.M., Ishikawa, N., and Perembo, R.C.B.,
                  2001. Micropaleontologic and paleomagnetic approaches to stratigraphic anom-
                  alies in rift basins: ODP Site 1109, Woodlark Basin. In Wilson, R.C.L., Whitmarsh,
                  R.B., Taylor, B., and Froitzheim, N. (Eds.), Non-volcanic Rifting of Continental Mar-
                  gins: Evidence from Land and Sea, Spec. Publ.—Geol. Soc. London, 187:389–404.




*Dates reflect file corrections or revisions.