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Document Type

Research

Abstract

The Nigger Hill District, located on the Wyoming-South Dakota border in the northwestern Black Hills, is an area of Paleozoic sedimentaries, dipping outward from a central core of various alkaline and sub-alkaline Tertiary intrusive, and pre-Cambrian pegmatitic granite and schists. The Tertiary igneous rocks are of interest for three reasons: (1) they may furnish data that will contribute to the much debated problem of the origin of alkaline rocks; (2) when their structural relations are better understood, it will be possible to interpret more correctly the mechanics of their intrusion and the type of intrusive body they represent; (3) apparently they have been the source of the gold in a rare genetic type of potential ore deposit.

Publication Date

1940

Journal Title

Proceedings of the Iowa Academy of Science

Volume

47

Issue

1

First Page

270

Last Page

271

Copyright

© Copyright 1940 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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