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The graptolite genus Hunnegraptus in the Early Ordovician of Texas, USA

Published online by Cambridge University Press:  20 May 2016

Jörg Maletz
Jörg Maletz*
Affiliation:
Department of Geology, State University of New York at Buffalo 14260-3050, USA,
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Abstract

The biostratigraphically important genus Hunnegraptus is recognized for the first time in the Marathon region, West Texas, based on restudy of the type material of Didymograptus novus Berry, 1960. The late Tremadoc Hunnegraptus Zone is the oldest unequivocally recognized graptolite zone in the Marathon region, underlain by faunas with nondiagnostic adelograptids. Hunnegraptus novus (Berry) shows a sicular bitheca, dichograptid stipes, and delayed first distal dichotomies as the most important rhabdosome characteristics. Hunnegraptus Zone faunas are more widely distributed in North America than previously realized and an immensely useful discovery for biostratigraphic correlation of this late Tremadoc time interval.

Type
Research Article
Information
Journal of Paleontology , Volume 80 , Issue 3 , May 2006 , pp. 423 - 429
Copyright
Copyright © The Paleontological Society 

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