From Wikipedia, the free encyclopedia
Judith River Formation
Judith River Formation
Judith River Formation Type Age Unit of Sub-units Geological formation Campanian Judith River Group Birch Lake Member, Ribstone Creek Member, Brosseau Member, Victoria Member Bearpaw Formation Claggett Formation, Pakowki Formation max 360 meters (1,181 ft)[1] Lithology Primary Other Siltstone and sandstone Coal, coquinas Location Named for Named by Coordinates Confluence of Judith River and Missouri River F.V. Hayden, 1871;[2] F.B. Meek, 1876.[3] 47°40′N 109°39′W / 47.667°N 109.65°W / 47.667; -109.65 (Judith River Formation)Coordinates: 47°40′N 109°39′W / 47.667°N 109.65°W / 47.667; -109.65 (Judith River Formation) Montana, Alberta, Saskatchewan United States, Canada
Fauna
Faunal list follows a review published by Ashok Sahni in 1972 unless otherwise noted.[4]
Amphibians
Amphibians of the Judith River Formation Taxa Family: • Discoglossidae 1. 3 potential species Genus: • Habrosaurus 1. H. dilatus Genus: • Lisserpeton 1. L. bairdi Genus: • Opisthotriton 1. O. kayi Family: • Pelobatidae? Hip bones, possibly representing a North American member of the European spadefoot toad family. A lungless salamander. A scapherpetonid salamander. Presence Description Disc-tongued frogs Images
Underlies Overlies Thickness
A siren.
A scapherpetonid salamander. A possible lungless salamander.
Region Country
The Judith River Formation is a fossil-bearing geologic formation in Montana, and is part of the Judith River Group. It dates to the upper Cretaceous. It is an historically important formation, explored by early American paleontologists such as Edward Drinker Cope, who named several dinosaurs from scrappy remains found here on his 1876 expedition (such as Monoclonius). Modern work has found nearly complete skeletons of the hadrosaurid Brachylophosaurus.
Genus: • Prodesmodon 1. P. copei Genus: • Scapherpeton 1. S. tectum
Lithology
The Judith River Formation is composed of mudstone, siltstone and sandstone.[1] Coal beds, bentonite and coquinas are also observed.
Ankylosaurian dinosaurs
Ankylosaurs of the Judith River Formation Taxa Genus: • Edmontonia 1. E. longiceps Presence Description Isolated tooth possibly belonging to Edmontonia. Images
1
From Wikipedia, the free encyclopedia
Genus: • Paleoscincus 1. P. costatus Isolated tooth that formed the basis of the dubious genus Paleoscincus. 1. Monoclonius crassus[5]
Judith River Formation
Choristoderes
Choristoderess of the Judith River Formation Taxa Images Genus: • Champsosaurus 1. C. sp. Presence Description Images
Bony fish
bony fish of the Judith River Formation Taxa Genus: • Belonostomus 1. B. longirostris Genus: • Kindleia 1. K. fragosa Genus: • Lepisosteus 1. L. occidentalis Genus: • ?Paralbula 1. ?P. sp. Presence Description An aspidorhynchiform.
Crocodilians
A bowfin. Crocodilians of the Judith River Formation Taxa A gar. Genus: • Brachychampsa 1. B. montana Genus: • Leidyosuchus 1. L. canadensis Presence Description An alligatorid. Images
An alligatorid.
A bonefish.
Lizards
Lizards of the Judith River Formation Taxa Genus: • Chamops 1. C. segnis Genus: • Exostinus 1. E. lancensis Genus: • Leptochamops 1. L. denticulatus Genus: • Paraderma 1. P. bogerti Genus: • Parasaniwa 1. P. wyomingensis Genus: • Peltosaurus 1. P. piger Presence Description A whiptail. Images
Cartilaginous fish
Cartilaginous fish of the Judith River Formation Taxa Genus: • Myledaphus 1. M. bipartitus Presence Description A stingray. Images
A knob-scaled lizard. A whiptail.
Ceratopsian dinosaurs
Ceratopsians of the Judith River Formation Taxa Genus: • Albertaceratops 1. Albertaceratops nesmoi[5] Genus: • Avaceratops 1. Avaceratops lammersi[5] Genus: • Ceratops 1. C. montanus Genus: • Monoclonius Presence Description Images
A parasaniwid.
A parasaniwid.
An anguid.
Ornithopod dinosaurs
Ornithopods of the Judith River Formation
2
From Wikipedia, the free encyclopedia
Taxa Genus: • Brachylophosaurus 1. B. canadensis Family: • Hadrosauridae 1. ?"Kritosaurus" breviceps Subfamily: • Lambeosaurinae 1. ?Lambeosaurus paucidens Genus: • Thescelosaurus 1. cf. T. neglectus Isolated teeth possibly beBralonging to chyloThescelosaurus. phosaurus Presence Description Images Genus: • Paronychodon 1. P. lacustris Subamily: • Tyrannosaurinae 1. Unnamed tyrannosaur[6] Genus: • Troodon 1. T. formosus
Judith River Formation
Dromaeosaurus
Turtles
Turtles of the Judith River Formation Taxa Genus: • Basilemys 1. B. sp. Presence Description A Mesoamerican river turtle. Images
Pachycephalosaurian dinosaurs
Pachycephalosaurs of the Judith River Formation Taxa Genus: • ?Stegoceras 1. ?S. validum Presence Description Images Isolated teeth possibly belonging to StegoStegoceras or a simceras ilar dinosaur.
Relationship with other units
The Judith River Formation conformably overlies the Claggett Formation and Pakowki Formation. It is overlain by the Bearpaw Formation.[1] It is equivalent to the Belly River Formation in the southern Canadian Rockies foothills, the Lea Park Formation in central Alberta and the Wapiti Formation in the northwestern plains. To the east, it correlates with the sum of Oldman Formation and Foremost Formation.
Theropod dinosaurs
Theropods of the Judith River Formation Taxa Genus: • Aublysodon 1. A. mirandus Presence Description Isolated tyrannosaur teeth assigned to the dubious genus Aublysodon. Isolated tyrannosaur teeth that formed the basis of the dubious genus Deinodon. Images
Sub-divisions
The Birch Lake Member and Ribstone Creek Member are sandstone units recognized inside the Judith River Formation. Other informal subdivisions include the Brosseau Member and Victoria Member, which are considered obsolete due to their inconsistent lateral distribution.
See also
• List of dinosaur-bearing rock formations
Genus: • Deinodon 1. D. horridus
References
[1] ^ Lexicon of Canadian Geological Units. "Judith River Formation". http://cgkn1.cgkn.net/weblex/ weblex_litho_detail_e.pl?00053:007256. Retrieved on 2009-02-06. Hayden, F.V., 1871. Geology of the Missouri Valley: Preliminary report (4th annual) of the Geol. Surv. of Wyoming and portions of contiguous territories. Meek, Fielding Bradford, 1876. A report on the invertebrate Cretaceous and Tertiary fossils of the upper Missouri country, Hayden, F.V., Geologist in
[2]
Genus: • Dromaeosaurus 1. D. albertensis
[3]
3
From Wikipedia, the free encyclopedia
Charge; United States Geologic and Geographic Survey of the Territories, vol. 9, page 629 Sahni, A. (1972). "The vertebrate fauna of the Judith River Formation, Montana." Bulletin of the AMNH, v. 147 article 6: 321-415. ^ Ryan and Evans, 2005 Stein and Triebold (2005). "Preliminary analysis of a sub-adult tyrannosaurid skeleton, known as "Sir
Judith River Formation
William" from the Judith River Formation of Petroleum County, Montana." In The origin, systematics, and paleobiology of Tyrannosauridae, a symposium hosted jointly by Burpee Museum of Natural History and Northern Illinois University, p. 27-28.
[4]
[5] [6]
Retrieved from "http://en.wikipedia.org/wiki/Judith_River_Formation" Categories: Mesozoic geologic formations, Geology of Montana, Geology of Alberta, Stratigraphy of Canada This page was last modified on 23 March 2009, at 22:30 (UTC). All text is available under the terms of the GNU Free Documentation License. (See Copyrights for details.) Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a U.S. registered 501(c)(3) tax-deductible nonprofit charity. Privacy policy About Wikipedia Disclaimers
4