found: Work cat: Kaykun, A. Sequence stratigraphy of the lower Pierre Shale in southern Powder River Basin, Wyoming USA, 2013page iii (lower Pierre Shale consists mostly of progradational shale sequences and two productive sandstone members encased in these shales)
found: GEOLEX, via WWW, February 25, 2015(Pierre Shale (CO*, KS*, MN, NE*, NM*, ND*, SD*, WY*); Pierre Shale of Montana Group (KS, MT*, ND, SD); called Fort Pierre a very long time ago; Geologic age: Late Cretaceous (Campanian to Maastrichtian)*; AAPG geologic province: Anadarko basin, Chadron arch*, Denver basin*, Las Vegas-Raton basin*, North Park basin*, Powder River basin*, Salina basin*, Sioux uplift*, Williston basin*, Wind River basin*; Asterisk (*) indicates usage by the U.S. Geological Survey)
found: GeoRef thesaurus, 2000(Pierre Shale, in Montana Group, E. Colorado, W. Minnesota, E. Montana, Nebraska, North Dakota, South Dakota, and E. Wyoming; broader terms: Upper Cretaceous, Cretaceous, Mesozoic)
found: Encyclopedia Britannica online, Mar. 2, 2015(Pierre Shale, division of Upper Cretaceous rocks in the United States (the Cretaceous Period lasted from about 146 million to 65.5 million years ago). Named for exposures studied near old Fort Pierre, S.D., the Pierre Shale occurs in South Dakota, Montana, Colorado, Minnesota, New Mexico, Wyoming, and Nebraska. The Pierre consists of about 600 m (about 2,000 feet) of dark gray shale, some sandstone, and many layers of bentonite (altered volcanic-ash falls that look and feel much like soapy clays). In some regions the Pierre Shale may be as little as 200 m (about 650 feet) thick. Archelon, the Cretaceous sea turtle fossil and largest known turtle species, has been found in the Pierre Shale of South Dakota)
notfound: GNIS, Mar. 2, 2015
