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Document Type

Research

Keywords

Pennsylvanian, Virgi lian; Wolfcampian; Beil Limestone; Lecompton Formation; Curzon Limestone; Topeka Formation; Arrectocrinus range zone; Cass County, Nebraska; Montgomery County, Iowa; Arrectocrinus hopperi. A. stanleyi, A. comminutus

Abstract

New species of Arrectocrinus Knapp from southwestern Iowa and southeastern Nebraska. Partial crowns of Arrectocrinus hopperi n.sp. show that the formerly poorly known arms of this genus are biserial and probably did not expand distalward. The Arrectocrinus range zones lowered to include the Beil Limestone Member of the Lecompton Formation (Virgilian). Possible affinities of Arrectocrinus with Erisocrinus are examined.

Publication Date

September 1977

Journal Title

Proceedings of the Iowa Academy of Science

Volume

84

Issue

3

First Page

106

Last Page

109

Copyright

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

Language

EN

File Format

application/pdf

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