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1 September 2009 A New Agelacrinitid Edrioasteroid Attached to a Large Hardground Clast from the McKenzie Member of the Mifflintown Member (Silurian) of Pennsylvania
Colin D. Sumrall, Carlton E. Brett, Michael L. McKinney
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Abstract

A new agelacrinitid edrioasteroid, Multiplexidiscus mckenziensis n. gen., n. sp. is described from the middle Silurian upper McKenzie Shale Member of the Mifflintown Formation of Pennsylvania. These edrioasteroids were attached to a large hardground clast that was reworked and flipped during a storm event. The occurrence of edrioasteroids in a near shore, perhaps in sub-normal salinity, is unusual for echinoderms. The edrioasteroids show a dispersed spatial distribution and weak thecal orientation. Multiplexidiscus differs from other agelacrinid edrioasteroids in the presence of a complex pattern of ambulacral cover plates combined with nearly straight paedomorphic ambulacra.

Colin D. Sumrall, Carlton E. Brett, and Michael L. McKinney "A New Agelacrinitid Edrioasteroid Attached to a Large Hardground Clast from the McKenzie Member of the Mifflintown Member (Silurian) of Pennsylvania," Journal of Paleontology 83(5), 794-803, (1 September 2009). https://doi.org/10.1666/08-096.1
Accepted: 1 May 2009; Published: 1 September 2009
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KEYWORDS
Edrioasteroidea
McKenzie
Mifflintown
New York
Silurian
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