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

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. earlier fieldwork proven the richness of the world, yet a big attempt began 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 likely new genus of hypsilophodontid, new pachycephalosaurs and ankylosaurs, numerous types of theropods (including a brand new genus of oviraptor
and a brand new tyrannosaur), plus the main entire specimen of a overdue Cretaceous therizinosaur ever amassed from North the US, and lots more and plenty extra. The study documented during this e-book is rewriting our realizing of past due Cretaceous paleobiogeography and dinosaur phyletics. on the most sensible of the Grand Staircase: The past due Cretaceous of Southern Utah is a massive stepping stone towards a complete synthesis of the ecology and evolution of the overdue Cretaceous ecosystems of western North the US.

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Extra resources for At the Top of the Grand Staircase : The Late Cretaceous of Southern Utah

Example text

22 Titus, Roberts, and Albright Dakota Formation The Dakota Formation was originally proposed by Meek and Hayden (1861), who designated the type section as the Missouri River bluffs in eastern Nebraska. Meek and Hayden (1856) had earlier extended the use of their informal Unit 1, which they later named the Dakota Group, into New Mexico, and it is clear that these authors presumed that the Dakota Formation was the lowest mappable Cretaceous unit throughout most of the United States Western Interior.

Sea levels during the Niobrara Eustatic Event were elevated almost as high as those of the Greenhorn (Hancock and Kauffman, 1979). Eastward movement of thrust sheets continued. The influx of sediment into the area from the Mogollon Highland and Sevier Fold and Thrust Belt was balanced by the creation of accommodation space and high sea levels, allowing coastal conditions to persist in the Kaiparowits Basin region for almost 15 Ma (Fig. 5). , 2003). Continued shortening in the Late Campanian and Maastrichtian led to large-scale partitioning of the Cordilleran Foreland Basin System through regional uplifts like the San Rafael Swell and Circle Cliffs Dome, heralding the start of the Laramide Orogeny.

2002a), placing it firmly within the middle Cenomanian (following Ogg, Agterberg, and Gradstein, 2004). Marine invertebrate fossils in the upper member suggest that the entire unit is middle Cenomanian in age (Fig. 10). The lower member is abundantly fossiliferous. Most of the fossil material by volume is plant, and coal is widespread in the member. Shell beds of unionoid bivalves and viviparidtype gastropods occur at the bases of sandstone channel bodies or in ironstone concretionary bodies.

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