Even though the Columbia River Flood Basalt Province is the smallest and youngest flood basalt province in the world, it still covers nearly 210,000 square kilometers of the U.S. Pacific Northwest.

A map of Columbia River Basalt Group highlighting the Steens Mountain and Picture Gorge sub-units and areas where Oregon sunstones have been found. OPB ...

To the north, the batholith is overlain by altogether different and much younger rocks. These are part of the Columbia River flood basalts, one of the largest outpourings of lava flows on Earth.

Flows of the Columbia River Basalt Group crop out mostly in eastern Washington and the High Lava Plains of central Oregon, but also extend westward through the Cascade Range to the offshore ...

On Aug. 7 at 6 p.m. Kootenai County leadership will decide if “Poplar Estates at English Point” (MSP24-0003) should be approved.

Lava flows of the Columbia River Basalt Group are tens to hundreds of miles long and likely record the emergence of the Yellowstone hotspot after a period of relative dormancy.

Basalt rocks line the Columbia River in southeastern Washington. Pacific Northwest National Lab said storing CO2 in basalt will be one tool to sequester carbon.