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Andesitic volcanic clasts in the Windy Gap Volcanic Member

By Geosciences and Environmental Change Science Center 2014 (approx.)
Andesitic volcanic clasts in the Windy Gap Volcanic Member
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Detailed Description

Typical andesitic volcanic clasts in the Windy Gap Volcanic Member at the base of the Paleocene Middle Park Formation. The youngest clast collected from this unit produced an Ar-Ar age of 60.5 Ma (Cole and others, 2010).

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