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Document Type

Research

Keywords

Crinoids (Delocrinus, Endelocrinus, Grajjhamicrinus, Pa/merocrinus, Diphuicrinus; Delocrinus hemisphericus, and Delocrinus elongatus 11. sp.); Chesterian (Lower Carboniferous); Pennsylvanian (Morrowan, Atokan, Desmoinesian, Missourian. Virgilian), Upper Carboniferous; Nodaway Coal; Coal Creek Limestone; Fremont County. Iowa; Taylor County, Iowa; Washington and Osage Counties. Oklahoma; Lower Permian (Wolfcampian)

Abstract

The purpose of the present study is to describe an historically important crown (cup with arms attached) of Delocrinus hemisphericus from Virgilian strata in Taylor County, Iowa, collected by C. A. White sometime during his tenure as State Geologist of Iowa (1866-1869) , and to clarify the present status of the genus Delocrinus. Several crowns of D. hemisphericus, one crown of Graffhamicrinus nodosarius (Strimple), and a divergent form described as Delocrinus elongatus n. sp. from the Virgilian of Oklahoma are illustrated. Possible phylogenies are discussed with emphasis on the genera Delocrinus. Graffhamicrinus. and Diphuicrinus.

Publication Date

December 1977

Journal Title

Proceedings of the Iowa Academy of Science

Volume

84

Issue

4

First Page

158

Last Page

162

Copyright

© Copyright 1977 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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