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BASEMAPS
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Smoke
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WEATHER
Eocene-Oligocene volcanic rocks (WAEOOGv;0)
Geologic Formation
in
WA
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Lithology
Arkose
Shale
Rhyolite
Other
(15,183 mi²)
Geologic Age
Eocene – Oligocene (56 Ma – 23.03 Ma ago)
Geologic Unit Label
EOOGv
Predominantly light-green, bedded andesite breccia with interbedded andesite and basalt flows, mudflows, and tuff beds; becomes more tuffaceous near top of unit. Includes tuffaceous and arkosic sandstone, shale, and carbonaceous shale beds in central and southern Cascade Mountians. Rhyodacite and quartz latite flows in northwestern Ferry County.
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USGS
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Geologic Formation
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