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Columbia River Basalt Group. (IDTcr;0)
Geologic Formation
in
ID
,
OR
,
WA
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Lithology
Basalt
Andesite
Geologic Age
Burdigalian – Messinian (17.5 Ma – 6 Ma ago)
Geologic Unit Label
Tcr
Large-volume lava flows of tholeiitic basalt, basaltic andesite, and subordinate andesite in western Idaho; consists of Imnaha Basalt (17.5-16.5 Ma), Grande Ronde Basalt (16.5-15.6 Ma), Wanapum Basalt (15.6-14.5 Ma), and Saddle Mountains Basalt (14.5-6 Ma). Includes porphyritic basalt and basaltic andesite in western Owyhee County. (Quaternary to Eocene Continental Volcanic and Intrusive Rocks).
—
USGS
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Geologic Formation
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