Correlation of Aptian-Albian Carbon Isotope Excursions in Continental Strata of the Cretaceous Foreland Basin, Eastern Utah, U.S.A.

Multi-Taxa Isotopic Investigation of Paleohydrology In the Lower Cretaceous Cedar Mountain Formation, Eastern Utah, U.S.A.: Deciphering Effects Of the Nevadaplano Plateau On Regional Climate

“…The upper Yellow Cat Member is a poorly sorted pebbly siltstone with abundant pedogenic carbonate, spring carbonate, and palustrine carbonate with interbedded small-channel sandstone and is likely no younger than , 119.4 6 2.6 Ma based on U/Pb date from carbonate at the base of the overlying Poison Strip Sandstone (Ludvigson et al 2010). An increase in pedogenic carbonates and poorly sorted sediments relative to the lower Yellow Cat Member suggests drier conditions.…”

“…It is light tan to white, medium-to coarsegrained, and contains cross-bedded to planar-bedded sandstone. Ludvigson et al (2010) radiometrically dated a palustrine carbonate (U/Pb from calcite) from the base of the Poison Strip Sandstone at , 119.4 6 2.6 Ma. This age is consistent with the detrital-zircon age of the upper Yellow Cat Member of 124 Ma ).…”

“…Dolomite is common in paleosols as well as dolomitic layers in lacustrine deposits and indicates xeric conditions. Only micritic pedogenic calcite analyzed under thin section from the study of Al-Suwaidi (2007) and Ludvigson et al (2010) were used in this study. Recently, a carbonisotope chemostratigraphic study by Ludvigson et al (2010) identified several distinct carbon-isotope excursions such as carbon-isotope feature Ap7 (Herrle et al 2004) at the base of the Ruby Ranch Member and the Al1 C-isotope feature in the upper Ruby Ranch, bracketing the age of the Ruby Ranch Member from the early-mid Aptian (,118 Ma) of the Albian (, 100.5 Ma).…”

Geology, Mantle Tomography, and Inclination Corrected Paleogeographic Trajectories Support Westward Subduction During Cretaceous Orogenesis in the North American Cordillera

“…1). The event consisted of the emplacement of huge thrust sheets containing >10 km thick sections of Neoproterozoic-Paleozoic platformal sedimentary rocks, that apparently originated outboard of the western edge of the North American platform terrace (Sheldon 1963;Armstrong and Oriel 1965;Picard et al 1969;Rose 1977 U-Pb date of uraniferous carbonate from the forebulge, and a good match between δ 13 C org excursions in early terrestrial foredeep sedimentary rocks and well-dated Albian features of the global carbon isotope chemostratigraphy (Ludvigson et al 2010).…”

“…Thus, by utilizing paleogeographic trajectories determined from migrating hotspots and paleomagnetism, corrected for inclination errors, the eastward V of the mid-mantle anomaly coincides with the Great Basin region of western North America between 140 Ma and 110 Ma, which based on (1) 124 Ma ash beds within the Buckhorn conglomerate, a unit at the base of the Sevier foredeep (Greenhalgh et al 2006); (2) detrital zircons within the foredeep atop the North American platform terrace (Britt et al 2007;Ludvigson et al 2010); (3) a 119 ±2.6 Ma U-Pb age of a uraniferous carbonate farther east in the thinner forebulge section to the east; and (4) a compelling match between δ 13 C org excursions in early terrrestrial foredeep sedimentary rocks with well-dated Albian features of the global carbon isotope chemostratigraphy (Ludvigson et al 2010), all indicate that North America entered the trench between 125 Ma and 120 Ma (Hildebrand 2013). Given all the uncertainties, this is a good match.…”