Mazama pumice deposits

Primary and reworked air-fall rhyodacite pumice related to climactic eruptions of Mount Mazama about 6,845 yr B.P.(14C). Mapped only where it extensively covers older units
State Oregon
Name Mazama pumice deposits
Geologic age Holocene
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic-air fall)
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-air fall)
References

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 - Grant - Klamath