The heteromorph ammonite Didymoceras cochleatum (Meek and Hayden, 1858), from the Pierre Shale of South Dakota and Wyoming. American Museum novitates ; no. 3268

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dc.contributor.authorKennedy, W. J. (William James)en_US
dc.contributor.authorCobban, William A., 1916-2015.en_US
dc.contributor.authorLandman, Neil H.en_US
dc.date.accessioned2005-10-06T16:48:09Z
dc.date.available2005-10-06T16:48:09Z
dc.date.issued1999en_US
dc.description8 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 7-8).en_US
dc.description.abstractThe middle Campanian (Upper Cretaceous) zone of Baculites gregoryensis Cobban, 1951 in south-central South Dakota and eastern Wyoming has yielded numerous fragments of a distinctive species of Didymoceras characterized by initial loose planispiral whorls followed by loose helical whorls, and finally by a slightly pendant body chamber. These fragments are referred to Didymoceras cochleatum (Meek and Hayden, 1858), a species based on one-half of a septate whorl from the helical growth stage. This species is abundant in the Gregory Member of the Pierre Shale along the Missouri River Valley in South Dakota, rare in the Red Bird Silty Member of the Pierre Shale in eastern Wyoming, and very rare in the Rock River Formation in southeastern Wyoming.en_US
dc.format.extent2561677 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/3050
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 3268en_US
dc.subject.lccQL1 .A436 no.3268 1999en_US
dc.subject.lcshDidymoceras cochleatum.en_US
dc.subject.lcshAmmonoidea -- South Dakota.en_US
dc.subject.lcshAmmonoidea -- Wyoming -- Niobrara County.en_US
dc.subject.lcshMollusks, Fossil -- South Dakota.en_US
dc.subject.lcshMollusks, Fossil -- Wyoming -- Niobrara County.en_US
dc.subject.lcshPaleontology -- Cretaceous -- South Dakota.en_US
dc.subject.lcshPaleontology -- Cretaceous -- Wyoming -- Niobrara County.en_US
dc.subject.lcshPaleontology -- South Dakota.en_US
dc.subject.lcshPaleontology -- Wyoming -- Niobrara County.en_US
dc.subject.lcshPierre Shale.en_US
dc.titleThe heteromorph ammonite Didymoceras cochleatum (Meek and Hayden, 1858), from the Pierre Shale of South Dakota and Wyoming. American Museum novitates ; no. 3268en_US
dc.typetexten_US

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