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Alcova Alcova Limestone annealing apatite Belle Fourche bentonite Big George Big Horn County Bighorn Mountains Black Hills Campanian Carlile central Wyoming Chugwater claystone coal beds Cody Shale Creek crossbedded Crow Mountain deposits disconformity Early Triassic environments erosion erosional facies fission-track fluvial unit fossils Fox Hills Sandstone ft thick Geological Survey Bulletin Gill and Cobban Goose Egg Formation gradient grains gypsum indicate Jelm Johnson County Jurassic laminated Laramie Range late lower maps marine Merewether Montana mudstone Natrona County Niobrara County nonmarine northern outcrops overlying Paleocene paleocurrent peat Permian Pierre Shale Pipiringos Powder River Basin progradational quadrangle red beds region reported Rocky Mountain Sage Breaks samples sandy sedimentary sediments sequence shale member siltstone silty source area South Dakota southeastern southern Spearfish strata stratigraphy subsurface surface swamps tectonic temperature tion track lengths Turonian U.S. Geological Survey unconformity unnamed red beds uplift Upper Cretaceous Wasatch Western Interior Weston County