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. previous fieldwork proven the richness of the world, yet an important attempt 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, 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 amassed from North the USA, and masses extra. The study documented during this ebook is rewriting our knowing of overdue 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 US.
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Additional info for At the Top of the Grand Staircase : The Late Cretaceous of Southern Utah
Some authors have attributed this uplift to migration of a tectonic forebulge through the region (Currie, 1997; Willis, 1999). Many inconsistencies in age relationships between supposed pre- and postforebulge deposits (particularly the widespread absence of Kimmeridgian through Barremian strata within the proximal part of the foreland basin and the uniform age of basal Cretaceous rocks throughout the region) make it unlikely that this model is entirely correct. It is possible that southern Utah was simply a cratonic block that completely rebounded after the cessation of Late Jurassic thrusting.
Clasts are mostly chert and quartzite cobbles, pebbles, and granules, but boulder-sized clasts of petrified wood (some >1 m long) and limestone are relatively common on the Markagunt and western Paunsaugunt plateaus. All identified wood samples consist of the araucarian genus Araucarioxylon (Gustason, 1989), which could be derived from either the Chinle or Morrison formations. The large size (>1 m) of some of the permineralized wood clasts observed in the Glendale area would suggest that derivation from the Chinle Formation is unlikely as the nearest source outcrops would have been over 140 km to the west in the Wah Wah Thrust area.
Permineralized wood is present but uncommon. 11. Nomenclatural history for the Cedar Mountain, Dakota, and Tropic formations in southern Utah. Anacardiaceae, and Rosaceae (Gustason, 1989; am Ende, 1991). Collectively, the fossil fauna and flora indicate freshwater, terrestrial habitats and a relatively humid climate. Upper Member The upper member of the Dakota has some of the lithologic character of the lower Dakota, with sandstones, carbonaceous beds, and thick mudstone sequences. However, it can be distinguished by its more yellowish color, more abundant sandstone, cyclic upward-coarsening sequences, and abundant feldspar grain content, as well as the presence of persistent, thin-bedded, hummocky, crossstratified sand sheets (Gustason, 1989).