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The Columbia River Basalt Group (including the Steen and Picture Gorge basalts) extends over portions of four states. The Columbia River Basalt Group (CRBG) is the youngest, smallest and one of the best-preserved continental flood basalt provinces on Earth, covering over 210,000 km 2 (81,000 sq mi) mainly eastern Oregon and Washington, western Idaho, and part of northern Nevada. [1]
The Ringold Formation represents sand and gravel placed by the Columbia River between 9 and 3 million years ago. These deposits overlay cooled lava erupted as part of the Columbia River Basalt Group, a type of volcanic eruption known as flood basalts erupting from fissures across eastern Washington and Oregon that were unrelated to the Cascade Range. [11]
The Columbia Plateau is an important geologic and geographic region that lies across parts of the U.S. states of Washington, Oregon, and Idaho. [1] It is a wide flood basalt plateau between the Cascade Range and the Rocky Mountains , cut through by the Columbia River .
Columbia River Basin. Wallula Gap (/ w ə ˈ l uː l ə /) is a large water gap of the Columbia River in the Northwestern United States, in Southeastern Washington.It cuts through the Horse Heaven Hills basalt anticlines in the Columbia River Basin, just south of the confluence of the Walla Walla and Columbia rivers.
The Touchet Formation or Touchet beds consist of well-bedded, coarse to fine sand and silt which overlays local bedrock composed of Neogene basalt of the Columbia River Basalt Group in south-central Washington and north-central Oregon.
The formation consists of two contrasting series of layers from the Columbia River Basalt Group. The layers are separated by an unconformity and provide an unobstructed view of this type of geologic phenomenon. [2] Sheep Rock is named for the bighorn sheep that used to inhabit the area. To the north is part of Red Ledge Mine in Deep Creek. [3]
Moses Coulee cuts into the Waterville Plateau, which lies in the northwest corner of the Columbia River Plateau.The plateau is part of the Columbia River Basalt Group, a large igneous province that lies across parts of the states of Washington, Oregon, and Idaho in the United States of America.
Rocks in the area are predominantly basalt, part of the Columbia River Basalt Group. Lava flows believed to have originated from the Yellowstone hotspot approximately 10 to 15 million years ago when the hotspot was located in western Idaho. These lava flows covered large portions of Washington and Oregon all the way to the Pacific Ocean in ...