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Document Type

Research

Keywords

Sygcaulocrinus, Bottom Dweller, Ordovician, Winneshiek County

Abstract

Attention is called to the synonomy of Ectenocrinus elongatus Thomas and Ladd, 1926, with Sygcaulocrinus typus Ulrich, 1924, both from the Ft. Atkinson Member, Maquoketa Formation (Ordovician), and to the probable bottom dwelling habitat of the species. Comparison is made with some Upper Paleozoic crinoids which are known to have been bottom dwellers. An accident in preparation of a specimen disclosed the solid base of the cup and the solid summit of the proximal columnal, both of which are illustrated.

Publication Date

September 1974

Journal Title

Proceedings of the Iowa Academy of Science

Volume

81

Issue

3

First Page

116

Last Page

118

Copyright

© Copyright 1974 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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