Mazama ash-flow deposits

Rhyodacitic to andesitic ash-flow deposits related to climactic eruptions of Mount Mazama about 6,845 yr B.P. (14C) (Bacon, 1983)
State Oregon
Name Mazama ash-flow deposits
Geologic age Holocene
Lithologic constituents
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-ash flow)
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic-ash flow)

Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.

Bacon, C.R., 1983, eruptive history of Mount Mazama and Crater Lake caldera, Cascade Range, U.S.A.: Journal of Volcanology and Geothermal Research, v. 19, p. 57-115.

NGMDB product
Counties Douglas - Jackson - Klamath