Uranium series, volcanic rocks. Application of U-series dating to volcanic rocks provides unique and valuable information about the absolute timing of crystallization and differentiation of magmas prior to eruption. The U—Th and ThRa methods are the most commonly employed for dating the crystallization of mafic to silicic magmas that erupt at volcanoes. Disequilibrium of some short-lived daughters of the uranium series such as Po may be fractionated by saturation of a volatile phase and can be employed to date magmatic gas loss that is synchronous with volcanic eruption e. Geologic history and palynologic dating of Paleocene deposits, western Rock Springs uplift, Sweetwater County, Wyoming. During the latest Cretaceous or earliest Paleocene , a northwest-southeast trending anticline developed in the area of the present Rock springs uplift in southwestern Wyoming.
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Feast to famine: Sediment supply control on Laramide basin fill. Erosion of Laramide -style uplifts in the western United States exerted an important first-order influence on Paleogene sedimentation by controlling sediment supply rates to adjacent closed basins. During the latest Cretaceous through Paleocene , these uplifts exposed thick intervals of mud-rich Upper Cretaceous foreland basin fill, which was quickly eroded and redeposited. Cretaceous sedimentary lithologies dominate Paleocene conglomerate clast compositions, and the volume of eroded foreland basin strata is approximately twice the volume of preserved Paleocene basin fill. As a result of this sediment oversupply, clastic alluvial and paludal facies dominate Paleocene strata, and are associated with relatively shallow and ephemeral freshwater lake facies.
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