Columbia River Basalt Group map shows main regions of basalt exposure in Washington, Oregon, Idaho and Nevada, USA. (usgs.gov)
Columbia River Basalt Group of
Blue Mountains
California
Cascade Range
Clearwater River
Columbia Basin
Columbia River
Deschutes River
Grande Ronde River
Idaho
Imnaha River
John Day River
Klickitat River
Lewiston Basin
Montana
Nevada
Oregon
Pacific Ocean
Pasco Basin
Pasco, Washington
Portland, Oregon
Prineville, Oregon
Pullman, Washington
Rocky Mountains
Salem, Oregon
Salmon River
Snake River
Spokane, Washington
Steens Mountain
Vantage, Washington
Wallowa Mountains
Washington
Wenatchee, Washington
Willamette River
Yakima River
Yakima, Washington
random
Cleveland, Ohio
tags
Clearwater Embayment
Columbia Gorge
Columbia Trans-Arc Lowland
Malheur Gorge
Oregon Plateau
Weiser Embayment
website
https://www.usgs.gov/media/images/columbia-river-basalt-group-map-shows-main-regions-basalt-exposu
