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Ctenacanthus and other chondrichthyan spines and denticles from the Minturn Formation (Pennsylvanian) of Colorado

Published online by Cambridge University Press:  20 May 2016

Wayne M. Itano ,
Karen J. Houck  and
Martin G. Lockley
Wayne M. Itano
Affiliation:
1995 Dartmouth Ave., Boulder, Colorado 80305,
Karen J. Houck
Affiliation:
Dept. of Geography, Geology, and Environmental Science, University of Colorado, Denver 80217
Martin G. Lockley
Affiliation:
Dept. of Geography, Geology, and Environmental Science, University of Colorado, Denver 80217
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Abstract

Chondrichthyan spines and dermal denticles are reported from the Middle Pennsylvanian Minturn Formation, Eagle County, Colorado. The most common element is a dorsal finspine referred to Ctenacanthus buttersi St. John and Worthen, 1883. Some of the specimens are more complete distally than the holotype and only previously figured specimen of C. buttersi. Less common remains include a dorsal finspine referred to Acondylacanthus nuperus St. John and Worthen, 1883, a smooth-ribbed dorsal finspine close to “Ctenacanthus” furicarinatus Newberry, 1875, a spine fragment probably referrable to Physonemus sp., and two large-noded dorsal finspines probably referrable to two different species of Bythiacanthus. Dermal denticles are referred to Petrodus patelliformis M'Coy, 1848. Ctenacanthus buttersi finspines and some large cladodont teeth, referred to “Symmorium” occidentalis (Leidy), 1859, may belong to the same species. This conjecture is based mainly on the relative abundances of chondrichthyan teeth found at the same locality.

Type
Research Article
Information
Journal of Paleontology , Volume 77 , Issue 3 , May 2003 , pp. 524 - 535
Copyright
Copyright © The Paleontological Society

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