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Description of two species of Hoploscaphites (Ammonoidea, Ancyloceratina) from the Upper Cretaceous (Lower Maastrichtian) of the U.S. Western Interior. (Bulletin of the American Museum of Natural History, no. 427)

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dc.contributor.author Landman, Neil H.
dc.contributor.author Kennedy, W. J. (William James)
dc.contributor.author Larson, Neal L.
dc.contributor.author Grier, Joyce C.
dc.contributor.author Grier, James W.
dc.contributor.author Linn, Tom.
dc.date.accessioned 2019-02-21T20:41:58Z
dc.date.available 2019-02-21T20:41:58Z
dc.date.issued 2019-02-22
dc.identifier.uri http://digitallibrary.amnh.org/handle/2246/6926
dc.description 72 pages : illustrations (some color), map ; 26 cm. en_US
dc.description.abstract Two species of scaphitid ammonites (Ammonoidea: Ancyloceratina) from the Upper Cretaceous (lower Maastrichtian) of the Western Interior of North America are described. Hoploscaphites macer, n. sp., is medium size, with coarse ribs on the phragmocone, which become finer on the body chamber, and closely spaced ventrolateral tubercles. It occurs in the upper part of the Baculites baculus Zone and lower part of the overlying B. grandis Zone in the Pierre Shale in Montana, Wyoming, and Colorado, and in the Bearpaw Shale in Montana. Hoploscaphites criptonodosus (Riccardi, 1983) is larger and more coarsely ornamented, including one or two rows of lateral tubercles on the flanks of the phragmocone. It occurs in the upper part of the Baculites baculus Zone and overlying B. grandis Zone in the Pierre Shale in Montana, Wyoming, Colorado, and possibly South Dakota, and in the Bearpaw Shale in Montana and Saskatchewan, Canada. Both species form part of an evolving lineage of Hoploscaphites that first appears in the Western Interior of North America in the middle Campanian. en_US
dc.language.iso en_US en_US
dc.publisher American Museum of Natural History. en_US
dc.relation
dc.relation.ispartofseries Bulletin of the American Museum of Natural History;no.427.
dc.subject Hoploscaphites macer. en_US
dc.subject Hoploscaphites criptonodosus. en_US
dc.subject Ammonoidea. en_US
dc.subject Pierre Shale. en_US
dc.subject Bearpaw Formation. en_US
dc.subject Great Plains. en_US
dc.subject West (U.S.) en_US
dc.subject Saskatchewan. en_US
dc.title Description of two species of Hoploscaphites (Ammonoidea, Ancyloceratina) from the Upper Cretaceous (Lower Maastrichtian) of the U.S. Western Interior. (Bulletin of the American Museum of Natural History, no. 427) en_US
dc.title.alternative Two species of Hoploscaphites. en_US


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  • Bulletin of the American Museum of Natural History
    The Bulletin, published continuously since 1881, consists of longer monographic volumes in the field of natural sciences relating to zoology, paleontology, and geology. Current numbers are published at irregular intervals. The Bulletin was originally a place to publish short papers, while longer works appeared in the Memoirs. However, in the 1920s, the Memoirs ceased and the Bulletin series began publishing longer papers. A new series, the Novitates , published short papers describing new forms.

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