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BASEMAPS
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WEATHER
Oligocene nonmarine rocks (WAOGc;0)
Geologic Formation
in
WA
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Lithology
Siltstone
Clay
Lignite
Other
(377 mi²)
Geologic Age
Late Eocene – Early Miocene (37.8 Ma – 15.97 Ma ago)
Geologic Unit Label
OGc
Andesite conglomerate, tuff beds, and mudflow material. Includes some interbedded andesite flows in Columbia River Gorge. Lake sediments with Oligocene flora in Republic area in Ferry County. Massive tuffaceous sandstone and siltstone with beds of coal and high-alumina clay in Castle Rock-Toledo coal district in Cowlitz and Lewis Counties; include local interbedded basalt flows and some marine and late Eocene rocks.
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