Ammonites from the upper part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum novitates ; no. 3388

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dc.contributor.authorLandman, Neil H.en_US
dc.contributor.authorCobban, William A., 1916-2015.en_US
dc.date.accessioned2005-10-06T16:41:29Z
dc.date.available2005-10-06T16:41:29Z
dc.date.issued2003en_US
dc.description45 p. : ill., maps ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 42-44).en_US
dc.description.abstractThe upper part of the Pierre Shale and Fox Hills Formation were deposited in the late Cretaceous (Maastrichtian) Western Interior Seaway. They crop out in a belt that roughly parallels the Front Range of the Rocky Mountains from Douglas to Weld County, Colorado. These rocks consist of sandy shales and sandstones and are overlain by the nonmarine Laramie Formation. A sparse assemblage of ammonites is present consisting of Coahuilites sheltoni Böse, 1928, Sphenodiscus pleurisepta (Conrad, 1857), Trachybaculites sp. cf. T. columna (Morton, 1834), Hoploscaphites birkelundae Landman and Waage, 1993, Hoploscaphites sp. cf. H. birkelundae, Jeletzkytes dorfi Landman and Waage, 1993, and Jeletzkytes sp. cf. J. dorfi. Hoploscaphites birkelundae and Jeletzkytes dorfi define the H. birkelundae Zone in the Western Interior, which represents the lower part of the Upper Maastrichtian. These rocks are thus equivalent in age to the Fox Hills Formation in Niobrara County, Wyoming, and older than the type Fox Hills Formation in north-central South Dakota. An analysis of the ratio of ⁸⁷Sr/⁸⁶Sr in a belemnite from this zone in Morgan County, Colorado, yields a value of 0.707790 ± 0.000008 (2-sigma SE), nearly identical to that of a bivalve from the same zone in Niobrara County, Wyoming (McArthur et al., 1994). The western shoreline of the seaway during the time of H. birkelundae extended as far west as northwestern Colorado and southwestern Wyoming.en_US
dc.format.extent4121121 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/2878
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 3388en_US
dc.subject.lccQL1 .A436 no.3388 2003en_US
dc.subject.lcshAmmonoidea -- Colorado.en_US
dc.subject.lcshMollusks, Fossil -- Colorado.en_US
dc.subject.lcshPaleontology -- Cretaceous -- Colorado.en_US
dc.subject.lcshPaleontology -- Colorado.en_US
dc.titleAmmonites from the upper part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum novitates ; no. 3388en_US
dc.title.alternativeColorado ammonitesen_US
dc.typetexten_US

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