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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 Columbia Plateau covers much of the Columbia River Basalt Group, shown in green on this map. The Washington cities of Spokane, Yakima and Pasco, and the Oregon city of Pendleton, lie on the Columbia Plateau. The Columbia Plateau is an important geologic and geographic region that lies across parts of the U.S. states of Washington, Oregon ...
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 Ringold Formation is a geologic formation in Eastern Washington, United States. The formation consists of sediment laid down by the Columbia River following the flood basalt eruptions of the Columbia River Basalt Group, and reaches up to 1,000 feet (300 m) thick in places. [6] [2] It preserves fossils dating back to the Neogene period. [7]
Bathymetric map of the mouth of the Columbia River. With an average flow at the mouth of about 265,000 cu ft/s (7,500 m 3 /s), [4] the Columbia is the largest river by discharge flowing into the Pacific from the Americas [25] and is the fourth-largest by volume in the U.S. [4] The average flow where the river crosses the international border ...
The top exposed layer of Columbia River Basalt Group basalt in the Saddle Mountains is the Saddle Mountain Basalt, which ranges from 120 – 240 meters (400 – 800 feet) in thickness and is interspersed by sedimentary layers of the Ellensburg Formation. The Saddle Mountain Basalt is composed of the Umatilla Member flows, the Wilbur Creek ...
Several million years ago, lava erupted from fissures in Oregon and Idaho creating what is known today as the Columbia River Basalt Group. There were over 300 individual flows with an average volume of 500–600 cubic kilometres (120–140 cu mi). This series of eruptions were unrelated to the volcanism occurring in the nearby Cascade Range.
This hydraulic head combined with a flow depth of from 60 to 120 meters (200 – 400 ft) provided the energy to achieve flood flow velocities as high as 30 m/s (65 mph), which eroded the topsoil and underlying basalt, gouging the complex network of channels, basins, potholes and buttes that are found there even today.