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Mineral Resources > Online Spatial Data > Geology > by state > Oregon

Tuff

Welded to unwelded, mostly vitric crystal and vitric ash-flow tuff of several ages. Glass in tuff locally altered to clay, zeolites, and secondary silica minerals
StateOregon
NameTuff
Geologic ageTertiary
Original map labelTut
Commentsmiscellaneous ash-flow tuffs of various Tertiary ages
Primary rock typeash-flow tuff
Secondary rock type
Other rock types
Lithologic constituents
Major
Igneous > Volcanic (Pyroclastic, ash-flow)various compositions
Map references
Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.
Unit references
Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.
Geographic coverageDouglas - Jackson - Lane - Linn

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=ORTut;0
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