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Document Type

Research

Keywords

lsophorus. Edriophus. Maquoketa Formation. Winneshiek County

Abstract

Two specimens of edrioasteroids have been found in the Maquoketa Formation, Richmond Group, Upper Ordovician of Iowa. This occurrence extends the geographic range of both genera, lsorophus Foerste (1917) and Edriophus Bell (1975) into Iowa which is the westernmost occurrence of these genera formerly recorded only east of Illinois. Isorophus was found in a horizon essentially barren of fossils but Edriophus is coexistent with more common echinoderms of the Maquoketa, including the crinoid genera Carabocrinus and Porocrinus.

Publication Date

March 1976

Journal Title

Proceedings of the Iowa Academy of Science

Volume

83

Issue

1

First Page

23

Last Page

27

Copyright

© Copyright 1976 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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