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 positioning of 1 of the best-known terrestrial files for the overdue Cretaceous. earlier fieldwork proven the richness of the realm, 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 likely new genus of hypsilophodontid, new pachycephalosaurs and ankylosaurs, numerous varieties 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 gathered from North the United States, and lots more and plenty extra. The learn documented during this ebook 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 an incredible stepping stone towards a complete synthesis of the ecology and evolution of the past due Cretaceous ecosystems of western North the United States.

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Between the East Kaibab Monocline and the Echo Cliffs Monocline), the uppermost beds of the Dakota range as high as the Vascoceras diartianum ammonite biozone (Titus, 2002) and yield large specimens of the ammonite Calycoceras cf. C. naviculare, as well as huge numbers of the oysters Exogyra olisiponensis and Exogyra kellumi in tidal channel lags. The biostratigraphy demonstrates that the upper member is nearly equivalent to the entire Hartland Shale Member of the Greenhorn Formation (lower upper Cenomanian).

The designated type section (Peterson, 1969b) is in what is called Smoky Hollow on the 1953 edition of the United States Geological Survey Nipple Butte 15-minute quadrangle. ” Thus, the designated type section is not located in what is presently called Smoky Hollow, but rather in Squaw Canyon. In most places the unit is less than 50 m thick, but it does reach a thickness of 100 m in the northeast part of the Kaiparowits Basin (Eaton, 1991). Eaton et al. (2001) estimated a similar thickness of 107 m for the unit on the western Markagunt Plateau, where it is significantly older than the type section (Collignoniceras woolgari ammonoid biozone).

This nomenclatural configuration stood unchanged for over 30 years, when Doelling et al. (2003) reassigned the conglomeratic beds to the Cedar Mountain Formation. Ulicˇný (1999) replaced the informal “lower,” “middle,” and “upper” member terminology with numbered units 1 through 6. Subsequent workers have not adopted Ulicˇný’s terminology because they are recognizable only locally in the Kaiparowits Basin. 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.

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