The Red Bird Section of the Upper Cretaceous Pierre Shale in WyomingDescription, environmental interpretation, and correlation of a 3,100-foot-thick sequence of marine shale. |
Common terms and phrases
ammonite Anisomyon apertural Aporrhais aragonite Back view Baculites baculus zone Baculites gregoryensis Baculites perplexus Baculites reesidei Bearpaw Shale beds bentonite Bird Silty Member Black Hills body whorl bryozoan C. S. Robinson calcite Campanian carination Creek Cushman Didymoceras Drepanochilus Evans and Shumard fauna feet figs figures Foraminifera Formation fossils Fox Hills Sandstone ft above base gastropods genus Graphidula gray Hall and Meek holotype Hoploscaphites Inoceramus internal mold J. R. Gill limestone limestone concretions living chambers lower unnamed shale Meek and Hayden Mello Mitten Black Shale Montana Natica Niobrara County outer lip paratype Pierre Shale Baculites Plate Range Zone Red Bird section Red Bird Silty Red Bird specimens Santonian scotti sculpture Shale Baculites baculus Sharon Springs Sharon Springs Member shell South Dakota species spiral stratigraphic Survey Prof suture thick U.S. Geol unnamed shale member Upper Cretaceous USGS USNM W. A. Cobban W. J. Mapel wall western interior Wyoming