02404oam 2200649I 450 991070730050332120160519131840.0(CKB)5470000002462498(OCoLC)889600599(EXLCZ)99547000000246249820140829d1990 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierAmmonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming /by William A. Cobban[Reston, Va.] :Department of the Interior, U.S. Geological Survey,1990.[Washington, D.C.] :United States Government Printing Office.1 online resource (iv, 13 pages, 11 pages of plates) illustrations, mapsEvolution of sedimentary basins--Powder River Basin ;ch. BU.S. Geological Survey Bulletin ;1917-BTitle from title screen (viewed Aug. 20, 2014).Includes bibliographical references.Ammonites and bivalves from Frontier Formation, WyomingAmmonoideaWyomingNatrona CountyBivalves, FossilWyomingNatrona CountyGeology, StratigraphicCretaceousPaleontologyWyomingNatrona CountyAmmonoideafastBivalves, FossilfastCretaceous Geologic PeriodfastGeology, StratigraphicfastPaleontologyfastFrontier FormationUnited StatesFrontier FormationfastWyomingNatrona CountyfastAmmonoideaBivalves, FossilGeology, StratigraphicPaleontologyAmmonoidea.Bivalves, Fossil.Cretaceous Geologic Period.Geology, Stratigraphic.Paleontology.Cobban William A.1916-2015,1390881Geological Survey (U.S.),COPCOPOCLCOOCLCFGPOBOOK9910707300503321Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming3460082UNINA