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A microcrinoid colony from a cephalopod body chamber (Chesterian: Arkansas)

Published online by Cambridge University Press:  19 May 2016

Royal H. Mapes ,
N. Gary Lane  and
Harrell L. Strimple
Royal H. Mapes
Affiliation:
Department of Geology, Ohio University, Athens 45701
N. Gary Lane
Affiliation:
Department of Geology, Indiana University, Bloomington 47405
Harrell L. Strimple
Affiliation:
Department of Geology, University of Iowa, Iowa City 52242
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Abstract

An unusual occurrence of a colony of microcrinoids from shale within a fragment of a large orthoconic nautiloid body chamber is described from the Imo Formation (Mississippian, Chesterian) near Elba, Arkansas. The colony, about 70 individuals, consists principally of immature specimens that lack facets for the arms, and a few mature specimens with four or five arm facets. The crinoids are interpreted as record of a census population that was engulfed suddenly by mud. The crinoids are assigned to Allagecrinus coronarius Gutschick, 1968. The body chamber may have been broken during predation by other large cephalopods, or sharks, known from the Imo, or by post-mortem transport. The shell served as a firm substrate on which the microcrinoid larvae could settle and the convex sides may have provided some protection from currents.

Type
Research Article
Information
Journal of Paleontology , Volume 60 , Issue 2 , March 1986 , pp. 400 - 404
Copyright
Copyright © The Paleontological Society 

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