Evidence for Late Tertiary Volcanic Activity in the Northern Black Hills, South Dakota

Details Evidence for Late Tertiary Volcanic Activity in the Northern Black Hills, South Dakota Evidence for Late Tertiary Volcanic Activity in the Northern Black Hills, South Dakota

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sci...196..977k&link_type=abstract

Science, Volume 196, Issue 4293, pp. 977

Computer Science

Scientific paper

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.

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