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Petrology of Crater Lake National Park

Thin sections of Andesite from the Crater Lake caldera rim, Sand Creek, The Watchman and Eagle Cove, The Geology and Petrography of Crater Lake National Park. 1902

Petrology is the study of rocks to determine their classification, composition, origin, occurrence, structure and geologic history. The different branches of study within the field of petrology correspond to the three types of rocks: igneous, sedimentary, and metamorphic. Due to the nature of Crater Lake, igneous rocks are one of the primary types of rocks studied.

See the The Rocks Of Crater Lake (Nature Notes From Crater Lake, N. H. Davidson, Vol. 17, 1951) for an introduction and for an in-depth look, see The Geology and Petrography of Crater Lake National Park, 1902. The new USGS Geologic map of Mt. Mazama and the caldera by Dr. Charles Bacon is an exciting new work.

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