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Document Type

Research

Abstract

In 1964, surface measurements of the vertical component of the earth's magnetic field were made in Keokuk County, Iowa. The geologic conditions responsible for the magnetic anomalies can be attributed almost entirely to changes in the lithology of the Precambrian crystalline basement complex about which no direct information is available. The basement complex probably includes granitic, basic igneous and/or metavolcanic rocks, and the estimated depth to the top of the complex is about 3,000 feet. There is little correlation between the magnetic anomalies and known Paleozoic structures, but knowledge of the structures is very limited.

Publication Date

1965

Journal Title

Proceedings of the Iowa Academy of Science

Volume

72

Issue

1

First Page

311

Last Page

316

Copyright

© Copyright 1965 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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