02314oam 2200625 450 991070970560332120180718085818.0(CKB)5470000002473195(OCoLC)896811399(OCoLC)995470000002473195(EXLCZ)99547000000247319520141123d1987 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierSome Middle Cenomanian (Upper Cretaceous) Acanthoceratid Ammonites from the western interior of the United States /by William A. CobbanWashington :Department of the Interior, U.S. Geological Survey,1987.1 online resource (iv, 28 pages) illustrations, mapsU.S. Geological Survey professional paper ;1445"Ammonites of the genera Calycoceras, Acanthoceras, Plesiacanthoceras, and Protacanthoceras from the Frontier Formation and equivalent rocks are described and illustrated."Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/).Includes bibliographical references (pages 24-26) and index.Some Middle Cenomanian AcanthoceratidaeFrontier FormationAmmonoideaFrontier FormationPaleontologyCretaceousPaleontologyUnited StatesAcanthoceratidaefastCretaceous Geologic PeriodfastPaleontologyfastUnited StatesfastAcanthoceratidaeAmmonoideaPaleontologyPaleontologyAcanthoceratidae.Cretaceous Geologic Period.Paleontology.Cobban William A.1916-2015,1390881Geological Survey (U.S.),COPCOPOCLCOOCLCFTRAALCUSTRAALOCLCAGPOBOOK9910709705603321Some Middle Cenomanian (Upper Cretaceous) Acanthoceratid Ammonites from the western interior of the United States3524964UNINA