PSIRFD_F_4

							Figure 4. Stratagraphic chart of Raton basin, Pike and San Isabel National Forests Study Area
                                       (Higley, 2005).

        Era            Period           Epoch                         Rock Unit

                                    Pleistocene
                     Quaternary                                   Ogallala Formation
                                     Pliocene
                      Neogene        Miocene                   Devil's Hole Formation
        Cenozoic                     Oligocene                   Farasita Formation
                                                                Huerfano Formation
                                        Eocene
                     Paleogene                                   Cuchara Formation
                                                              Poison Canyon Formation
                                    Paleocene
                                                                   Raton Formation
                                                                 Vermejo Formation
                                                                  Trinidad Sandstone
                                                                      Pierre Shale
                                                                                     Smoky Hill Marl
                                        Upper     Niobrara Formation
                     Cretaceous                                                    Fort Hays Limestone
                                                                                    Codell Sandstone
        Mesozoic




                                                                                       Carlile Shale
                                                     Benton Shale
                                                                                 Greenhorn Limestone
                                                                                     Graneros Shale
                                        Lower                     Dakota Sandstone
                                                                         hiatus
                       Jurassic         Upper                    Morrison Formation
                                                                  Entrada Sandstone
                                        Upper                       Dockum Group
                       Triassic
                                        Lower
                                                                        hiatus
                                        Upper
                                                                   Bernal Formation
                                        Middle
                                                                San Andres Limestone
                      Permian
                                                                  Glorieta Sandstone
                                                                   Yeso Formation
                                        Lower




                                                              Sangre de Cristo Formation
                                        Upper
        Paleozoic




                    Pennsylvanian

                                                                  Magdalena Group
                                        Middle


                                        Lower
                                                                        hiatus


                                        Upper                     Tererro Formation
                    Mississippian

                                                                        hiatus
                                        Lower

                             Devonian                          Espirtu Santo Formation