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Maastrichtian Ammonites Chiefly from the Prairie Bluff Chalk in Alabama and Mississippi

Published online by Cambridge University Press:  11 August 2017

W. A. Cobban  and
W. J. Kennedy
W. A. Cobban
Affiliation:
U.S. Geological Survey, Box 25046, Mail Stop 919, Federal Center, Denver, Colorado 80225
W. J. Kennedy
Affiliation:
Geological Collections, University Museum, Parks Road, Oxford OX1 3PW, United Kingdom
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Abstract

The Prairie Bluff Chalk of Alabama and Mississippi yields a diverse ammonite fauna of Maastrichtian age. Twenty-eight species, of which three are new, are recorded herein: Pseudophyllites indra (Forbes, 1846), Hauericeras rembda (Forbes, 1846), Pachydiscus (Pachydiscus) maconensis n. sp., P. (P.) cf. gollevillensis (d'Orbigny, 1850), P. (P.) jacquoti (Seunes, 1890), P. (P.) egertoni (Forbes, 1846), Sphenodiscus lobatus (Tuomey, 1854), S. pleurisepta (Conrad, 1857), Coahuilites sheltoni Böse, 1928, Nostoceras (Nostoceras) alternatum (Tuomey, 1854), N. (N.) mendryki Cobban, 1974a, N. (N.) magdadiae Lefeld and Uberna, 1991, N. (N.) irregulare n. sp., Glyptoxoceras torquatum (Morton, 1834), Glyptoxoceras sp. A, Glyptoxoceras? sp., Baculites lomaensis Anderson, 1958, Baculites spp. A–C, Eubaculites labyrinthicus (Morton, 1834), E. carinatus (Morton, 1834), Baculites? trabeatus (Morton, 1834), Trachybaculites columna (Morton, 1834), Discoscaphites conradi (Morton, 1834), D. gulosus (Morton, 1834), Jeletzkytes criptonodosus Riccardi, 1983, Trachyscaphites alabamensis n. sp., and T. yorkensis (Stephenson, 1941). One genus, Trachybaculites, is new. The bulk of the fauna can be referred to a Discoscaphites conradi assemblage zone, but some elements in the fauna are significantly older.

Type
Research Article
Information
Journal of Paleontology , Volume 69 , Issue S44: The Paleontological Society Memoir 44: Maastrichtian Ammonites Chiefly from the Prairie Bluff Chalk in Alabama and Mississippi , September 1995 , pp. 1 - 40
Copyright
Copyright © 1995 by The Paleontological Society, Inc. 

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