Ancient Granite Gneiss in the Black Hills, South Dakota
- 31 July 1964
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 145 (3631) , 479-481
- https://doi.org/10.1126/science.145.3631.479
Abstract
Granite gneiss, with an age of approximately 2.5 billion years, in the Black Hills, South Dakota, provides a link between ancient rocks in western Wyoming and Montana and in eastern North and South Dakota and Minnesota. The discovery suggests that early Precambrian rocks covered an extensive area in northcentral United States and were not restricted to several small nuclei.Keywords
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