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