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 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 possible new genus of hypsilophodontid, new pachycephalosaurs and ankylosaurs, a number of forms of theropods (including a brand new genus of oviraptor
and a brand new tyrannosaur), plus the main entire specimen of a past due Cretaceous therizinosaur ever gathered from North the USA, and masses extra. The study documented during this ebook is rewriting our figuring out of past due Cretaceous paleobiogeography and dinosaur phyletics. on the best of the Grand Staircase: The overdue Cretaceous of Southern Utah is an immense stepping stone towards a complete synthesis of the ecology and evolution of the past due 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
16). Approximately 20 kg of sample was separated for both sanidine and zircon phenocrysts, which were independently dated both by U-Pb thermal ionization mass spectrometry analysis on zircon at the Massachusetts Institute of Technology by S. Bowring and by laser fusion 40Ar/39Ar analysis on sanidine at the Berkeley Geochronology Center by A. Deino. This is the first radiometric age date for the Straight Cliffs east of the Markagunt Plateau. 70 Ma for the zircon and sanidine, respectively (Fig. 16).
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).
Petrified wood and other fossil flora are also very common in the upper portion. Smoky Hollow Member The name Smoky Hollow Member was given by Peterson (1969b) to the recessive series of carbonaceous mudstones, mudstones, coals, sandstones, and conglomerates that overlie the Tibbet Canyon Member and weather into a topographic bench. 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.
At the Top of the Grand Staircase : The Late Cretaceous of Southern Utah by Alan L. Titus, Mark A. Loewen