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Document Type

Research

Abstract

Samples of the large granitic boulders of the Iowan drift were analyzed and features of the boulder distribution were examined. The analysis gave evidence of a central body of single granite stock which included more than 80 per cent of all large boulders examined within the Iowan drift area. Characteristics of this main granite stock were then compared to the bedrock areas which could be considered source regions of the boulders. All evidence pointed toward a source region in the large granite body found in central and west central Minnesota. Weathering and structural features of the boulders suggested that they may have been formed by secular weathering prior to their glacial transport.

Publication Date

1969

Journal Title

Proceedings of the Iowa Academy of Science

Volume

76

Issue

1

First Page

282

Last Page

295

Copyright

© Copyright 1969 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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