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This is the preliminary version of a video that demonstrates the maximum distribution of the glaciers Colorado at 20,000 years ago. The animation is a flyaround of the state showing the distribution of the ice, its presence in the high valleys, and the adjacent high peaks. Key geographic features and towns are annotated

The video demonstrates three concepts: (1) the high mountains of Colorado had extensive glaciers,and (2) glaciers are a major source of erosion in the high mountains

The distribution of the glaciers is from Jack Reed, USGS, Lakewood, Colorado. Video is created by James Adson, Ludvig Rhodin, Joseph Rogers, and Paul Weimer.

Interactive Geology Project, University of ColoradoBoulder. igp.colorado.edu