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Upper Campanian (Upper Cretaceous) ammonites from the Marshalltown formation-Mount Laurel boundary beds in Delaware

Published online by Cambridge University Press:  20 May 2016

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

New collections from the Marshalltown Formation and basal Mount Laurel Sand along the Chesapeake and Delaware Canal in Delaware clarify the ammonite dating of the interval. The Marshalltown Formation yields Pachydiscus (Pachydiscus) sp., Menuites portlocki (Sharpe, 1855) complexus (Hall and Meek, 1856), a subspecies restricted to the Baculites gregoryensis and Baculites scotti zones in the Western Interior of the United States, and Didymoceras binodosum (Kennedy and Cobban, 1993a) known only from the B. scotti zone of the Western Interior and correlatives in Arkansas and Texas. The basal part of the Mount Laurel Sand contains a complex assemblage preserved as phosphatic molds: Nostoceras (Nostoceras) monotuberculatum Kennedy and Cobban, 1993a, Nostoceras (N.) sp., Didymoceras platycostatum (Kennedy and Cobban, 1993b), D. stevensoni (Whitfield, 1877) (previously thought to be from the Marshalltown) and Exiteloceras jenneyi (Whitfield, 1877). The last two are index species of their eponymous zones in the Western Interior. This sequence is compatible with ammonites from the Wenonah Formation, which lies between the Marshalltown and Mount Laurel to the north and contains ammonites indicative of the Baculites scotti zone, and the fauna from higher in the Mount Laurel Sand, which includes elements of the Didymoceras cheyennense and Baculites compressus zones of the Western Interior sequence.

Type
Research Article
Information
Journal of Paleontology , Volume 71 , Issue 1 , January 1997 , pp. 62 - 73
Copyright
Copyright © The Paleontological Society 

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