1. Geologic map of the Collegiate Peaks Wilderness Area and the Grizzly Peak Caldera, Sawatch Range, central Colorado Yale Public content 1998. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by U.S. Geological Survey Information Services. English. Public. Colorado and Collegiate Peaks Wilderness.