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Document Type

Research

Abstract

The presence of great numbers of geodes of varying size and degree of development in the Keokuk beds of the Central Mississippi Valley has long been known to geologists, but their origin has been, from the earliest times, a disputed question, and, although there has been considerable speculation upon the subject, no theory of their formation has been, as yet, widely held.

Publication Date

1912

Journal Title

Proceedings of the Iowa Academy of Science

Volume

19

Issue

1

First Page

169

Last Page

172

Copyright

© Copyright 1912 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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