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Document Type

Research

Abstract

A tentative framework of ten echinoderm zonules, some of which are not new, is proposed: Nortonechinus owensis Zonule (upper Owen Member, Lime Creek Formation): Dactylocrinus Zonule (upper Cerro Gordo Member), Xenocidaris Zonule (lower Cerro Gordo Member, Lime Creek Formation); Desmidocrinus Zonule, Belanskicrinus Zonule, Agelacrinites Zonule (Mason City Member, Shell Rock Formation); Strobilocystites Zonule, Euryocrinus Zonule (upper Rapid Member), Hexacrinites Zonule (middle Rapid Member), Megistocrinus clarki Zonule (lower Rapid Member, Cedar Valley Formation). Some forms, or assemblages, appear to have decided stratigraphic significance, but more study is needed.

Publication Date

1970

Journal Title

Proceedings of the Iowa Academy of Science

Volume

77

Issue

1

First Page

249

Last Page

256

Copyright

© Copyright 1970 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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