Evidence for Late Tertiary Volcanic Activity in the Northern Black Hills, South Dakota
- 27 May 1977
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 196 (4293) , 977
- https://doi.org/10.1126/science.196.4293.977
Abstract
Rhyolitic volcanic rock in the northern Black Hills has a potassium-argon isotopic age of 10.5 ± 1.5 million years. This is considerably younger than any previously reported igneous activity in this or adjacent areas and indicates that the renewed uplift of the Black Hills, which occurred after the Oligocene epoch, was also accompanied by some volcanism.Keywords
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