At the Top of the Grand Staircase : The Late Cretaceous of by Alan L. Titus, Mark A. Loewen

By Alan L. Titus, Mark A. Loewen

The Grand Staircase-Escalante nationwide Monument is the site of 1 of the best-known terrestrial documents for the overdue Cretaceous. past fieldwork proven the richness of the world, yet an enormous attempt all started within the new century has documented over 2,000 new vertebrate fossil websites, supplied new radiometric dates, and pointed out 5 new genera of ceratopsids, new species of hadrosaur, a possible new genus of hypsilophodontid, new pachycephalosaurs and ankylosaurs, a number of sorts of theropods (including a brand new genus of oviraptor
and a brand new tyrannosaur), plus the main whole specimen of a past due Cretaceous therizinosaur ever accumulated from North the United States, and lots more and plenty extra. The learn documented during this booklet is rewriting our knowing of overdue Cretaceous paleobiogeography and dinosaur phyletics. on the best of the Grand Staircase: The past due Cretaceous of Southern Utah is an enormous stepping stone towards a complete synthesis of the ecology and evolution of the overdue Cretaceous ecosystems of western North the United States.

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13. Specimens of the ammonite Eumophaloceras cf. E. costatum that occur in abundance around hydrocarbon cold seep limestone mounds in the lower member of the Tropic Shale, southern Kaiparowits Plateau. further subdivided by Peterson (1969b) into, in ascending order, the Tibbet Canyon, Smoky Hollow, John Henry (Fig. 14), and Drip Tank members (Fig. 16). The type sections for all of the members are located in the south-central portion of the Kaiparowits Plateau (Fig. 3), where exposures are especially good.

For an extended 20-million-year period, a complex interplay between eustasy, tectonics, and sedimentation rates caused alternating marine 14 Cretaceous sedimentation in southern Utah initiated in the late Early Cretaceous in response to lithospheric flexure caused by thrust loading within the Sevier Fold and Thrust Belt coupled with eastward progradation of a thick clastic wedge into the Cordilleran Foreland Basin System (DeCelles and Giles, 1996). , 1999), and because underlying Jurassic units of the San Rafael Group are significantly eroded, it is likely that the entire western margin of the southern Cordilleran Foreland Basin System was uplifted between Tithonian and early Barremian time.

Petrified wood (primary fossils, not reworked) and 2–3-cm-diameter bone and turtle shell fragments are not uncommon in the Calico bed. , 1997). Geologic Overview 31 John Henry Member The John Henry Member is lithologically variable like the Smoky Hollow Member but much thicker (Fig. 7). Sandstone, carbonaceous and noncarbonaceous mudstone, and coal make up the bulk of the rock types. 8 km east of John Henry Canyon. Thickness ranges between 200 and 340 m, with a definite northeast thickening trend.

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