[Illustration: Eunice Lake, northwest of Mount Rainier. The lake lies in a small bedrock basin that was scoured out by a glacier between about 15,000 and 20,000 years ago. The rounded green slopes at the far edge of the lake are underlain by rock that has been smoothed and grooved by glacier ice. This side of Mount Rainier rises to Liberty Cap, which hides the true summit of the volcano.] The Geologic Story of Mount Rainier By Dwight R. Crandell _A look at the geologic past of one of America’s most scenic volcanoes_ GEOLOGICAL SURVEY BULLETIN 1292 UNITED STATES DEPARTMENT OF THE INTERIOR WALTER J. HICKEL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director Library of Congress Catalog-Card No. 79-601704 U.S. GOVERNMENT PRINTING OFFICE: 1969 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402—Price 65 cents (paper cover) contents Page The changing landscape of 12-60 million years ago 3 Thumbnail biography of Mount Rainier 11 Results of recent eruptions 12 Why glaciers? 23 Work habits of glaciers 25 Yesterday’s glaciers 29 Landslides and mudflows—past, present, and future 35 The volcano’s future? 42 Further reading in geology 43