Glaciation of Crater Lake National Park
While the fact is not widely appreciated, the existing
remnant of old Mount Mazama affords an excellent field for the study of glacial erosion.
The glaciers reached their maximum size some 25,000 years ago at the end of the Pleistocene Epoch, obtaining a depth of 1,000 feet and extending 10 to 17 miles from the summit.
During the final retreat, when the glaciers were confined to the canyon bottoms of the upper slopes, a semicircular line of parasitic volcanoes developed on the northern slope of
the mountain, about 5,000 feet below the summit, what is now the rim of caldera.
[Crater Lake National Park General Management Plan,
December 1977, Part 2, pp. 2, 4]
Soil Survey of Crater Lake National
Natural Resources Conservation Service, National Park Service, U.S. Dept. of the Interior.
Glaciation of Mount Mazama, The Geology and Petrography of Crater Lake National Park, 1902, Part I, Joseph Silas
Diller and Horace Bushnell Patton
The Glaciation of Mount Mazama, The Geology of Crater Lake National Park, Oregon (1942) by Howell Williams
Nature Notes From Crater Lake
Three Successive Records Of Glaciation -
Clark, Vol. 6 No. 3 - August 1933
Glaciation of Mount Mazama -
Dr. W. R. Atwood, Vol. 4 No. 3 - September 1931
A Glaciated Surface -
F. Lyle Wynd, Vol. 3 No. 2 - August 1930
Carbonized Tree Found Within The Rim -
Libbey, Vol. 6 No. 3 - August 1933
Llao Rock, A Lava Flow Burying A Glacial Valley -
Wayne E. Kartchner, Vol. 10, No. 3, 1937
The Retreat Of Mount Mazama Glaciers
Kinsley, Vol. 14, 1948
Franklin C. Potter, Vol. 15 - September 1949