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Echinoderms from the lower Silurian Brassfield Formation of east-central Kentucky

Published online by Cambridge University Press:  04 June 2015

William I. Ausich ,
Mark E. Peter  and
Frank R. Ettensohn
William I. Ausich
Affiliation:
School of Earth Sciences, 155 South Oval Mall, The Ohio State University, Columbus, OH 43210, USA, ;
Mark E. Peter
Affiliation:
School of Earth Sciences, 155 South Oval Mall, The Ohio State University, Columbus, OH 43210, USA, ;
Frank R. Ettensohn
Affiliation:
Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506, USA,
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Abstract

A new echinoderm fauna is reported from the Brassfield Formation (Rhuddanian, Silurian) of Bath County, Kentucky. The Brassfield Formation was the first extensive marine unit to be deposited following the end-Ordovician glaciation and extinctions and represents several shallow, open-marine facies. These facies supported a diverse pelmatozoan fauna. This report not only extends the geographic distribution of this fauna, but also the temporal range of the fauna back to Rhuddanian time. Six pelmatozoans are reported, including the crinoids Browerocrinus arthrikos n. gen. n. sp., Temnocrinus americanus n. sp., Stereoaster sp., and Dendrocrinus sp.; and the glyptocystitids Brockocystis nodosarius Foerste, 1919, and Anartiocystis whitei Sumrall, 2002. In addition, the asteroid Gordonaster brassfieldensis Blake and Ettensohn, 2009, was reported previously from this locality. Browerocrinus increases the diverse calceocrinid fauna from the Brassfield Formation; Temnocrinus was previously only known from the Homerian (Silurian) of England; and this is the first known occurrence of Stereoaster beyond the greater Dayton, Ohio, region. Furthermore, this is the first Brassfield locality known with two glyptocystitid taxa.

Type
Articles
Information
Journal of Paleontology , Volume 89 , Issue 2 , March 2015 , pp. 245 - 256
Copyright
Copyright © 2015, The Paleontological Society 

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