Stratigraphy Depositional Environments And Sedimentary Tectonics Of The Western Margin Cretaceous Western Interior Seaway PDF Download

Grand Staircase-Escalante National Monument contains abundant fossil material in most formations within its borders. These formations range in age from Permian to Cretaceous. More than 800 individual fossil localities are known so far, and almost all areas of the monument that were examined contain at least some fossil material. Important new findings of this survey include: several partial dinosaur skeletons in the Kaiparowits Formation; a ceratopsian skull in the Wahweap Formation; the previously unreported presence of many ammonoid and bivalve genera in the monument in the Dakota, Tropic, and Straight Cliffs Formations; the first fossils of any kind from the Entrada Sandstone within the monument, including a dinosaur tracksite containing more than 250 tracks of at least 30 individuals; previously unrecognized sites and abundances of vertebrate ichnogenera in the Navajo, Kayenta, Moenave, and Chinle Formations; the first ichnofossil material from the Wingate Sandstone in the monument; and a previously unreported sponge genus from the Kaibab Limestone. The Cretaceous rocks exposed within the monument contain one of the best and most continuous records of Late Cretaceous terrestrial life in the world. Research on these strata is still in its earliest stages.