Geologic Unit: Columbia River

Usage:

Columbia River Basalt Group (ID*,OR*,WA*)
Columbia River Basalt (ID*,OR*,WA*)

[Columbia River Basalt Group adopted by the ID, OR, and WA Geol. Surveys, and the USGS (rules suspended).]

Subunits:

GROUP STATUS (alphabetical): Grande Ronde Basalt (ID*,OR*,WA*), Imnaha Basalt (ID*,OR*,WA*), /Picture Gorge basalt subgroup [informal] (OR) or Picture Gorge Basalt (OR*), Saddle Mountains Basalt (ID*,OR*,WA*), Wanapum Basalt (ID*,OR*,WA*), Weiser Basalt (ID), /Yakima basalt subgroup [informal] (ID*,OR*,WA*).

Geologic age:

late Tertiary (Miocene)*

Type section, locality, area and/or origin of name:

[Notable exposures in Columbia River Valley, OR, WA, and ID.]

AAPG geologic province:

Blue Mountains province*
Eastern Columbia basin*
Idaho Mountains province*
Snake River basin*