By Alan L. Titus, Mark A. Loewen
The Grand Staircase-Escalante nationwide Monument is the site of 1 of the best-known terrestrial files for the overdue Cretaceous. previous fieldwork proven the richness of the world, yet an incredible 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, a number of sorts 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 US, and lots more and plenty extra. The learn documented during this booklet is rewriting our figuring out 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 overdue Cretaceous ecosystems of western North the USA.
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Extra resources for At the Top of the Grand Staircase : The Late Cretaceous of Southern Utah
Two opposing stratigraphic interpretations of the Tibbet Canyon Member have been proposed: first, there is a significant diastem at the base of the fluviodeltaic interval in the Tibbet Canyon Member (base of the Smoky Hollow sequence) representing a major sequence boundary; or second, 28 Titus, Roberts, and Albright the section is essentially conformable up to the Smoky Hollow–John Henry contact and the facies shift observed in the Tibbet Canyon Member is largely the result of allogenic coastal processes imprinted over a more gradual base level fall.
Coal is abundant, particularly in what are known as the Alvey (upper) and Christensen (lower) zones. Seven separate mappable shoreface sandstone bodies, labeled A to G, have been recognized in the member in its eastern exposures (Peterson, 1969a). ” Extremely detailed lithostratigraphic studies have been conducted on the John Henry Member by Vaninetti (1978), Shanley and McCabe (1991), Shanley, McCabe, and Hettinger (1992), Hettinger (1993, 1995), Hettinger, McCabe, and Shanley (1994), Allen and Johnson (2010a, 2010b), and Gallin, Johnson, and Allen, (2010).
Coincident with thrust loading were the extremely high sea levels (Fig. 4) of the Greenhorn Eustatic Event (late Albian–middle Turonian). By late Cenomanian time, sandstone compositions in the Kaiparowits Basin indicate that granitic source areas in central Arizona were also feeding the Kaiparowits Basin (Gustason, 1989). Although DeCelles (2004) shows a magmatic arc in southern Arizona during the Cenomanian, how the tectonics of this area affected the Kaiparowits Basin is still unclear. Elder and Kirkland (1993, 1994) postulated a rifted highland margin (Mogollon Highland) inboard of the Arizona magmatic arc as the source for Kaiparowits Basin feldspathic sands.
At the Top of the Grand Staircase : The Late Cretaceous of Southern Utah by Alan L. Titus, Mark A. Loewen