Early Tertiary Age of Pitchstone in the Northern Black Hills, South Dakota

Details Early Tertiary Age of Pitchstone in the Northern Black Hills, South Dakota Early Tertiary Age of Pitchstone in the Northern Black Hills, South Dakota

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sci...220.1153r&link_type=abstract

Science, Volume 220, Issue 4602, pp. 1153-1154

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Scientific paper

A block of pitchstone in the northern Black Hills, South Dakota, is Paleocene in age, according to potassium-argon dating of biotite and fission-track dating of zircon in the sample. These data invalidate published suggestions that the age is much younger. The pitchstone is not extrusive in its present position but instead is in a volcanic pipe with other fragments that came downward from as much as 1100 meters above the modern surface.

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