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  2. Columbia River Basalt Group - Wikipedia

    en.wikipedia.org/wiki/Columbia_River_Basalt_Group

    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]

  3. Flood basalt - Wikipedia

    en.wikipedia.org/wiki/Flood_basalt

    Moses Coulee in the US showing multiple flood basalt flows of the Columbia River Basalt Group. The upper basalt is Roza Member, while the lower canyon exposes Frenchmen Springs Member basalt A flood basalt (or plateau basalt [ 1 ] ) is the result of a giant volcanic eruption or series of eruptions that covers large stretches of land or the ...

  4. Columbia Plateau - Wikipedia

    en.wikipedia.org/wiki/Columbia_Plateau

    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.

  5. Wallula Gap - Wikipedia

    en.wikipedia.org/wiki/Wallula_Gap

    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.

  6. Missoula floods - Wikipedia

    en.wikipedia.org/wiki/Missoula_floods

    These floods were the result of periodic sudden ruptures of the ice dam on the Clark Fork River that created Glacial Lake Missoula. After each ice dam rupture, the waters of the lake would rush down the Clark Fork and the Columbia River, flooding much of eastern Washington and the Willamette Valley in western Oregon. After the lake drained, the ...

  7. List of flood basalt provinces - Wikipedia

    en.wikipedia.org/wiki/List_of_Flood_basalt_provinces

    Columbia River Basalt Group [g] Chilcotin Plateau Basalts [e] Increased Antarctic deep waters ... Madagascar flood basalt (94.5±1.2) Cenomanian: 100.5 * Lower: Albian:

  8. Ringold Formation - Wikipedia

    en.wikipedia.org/wiki/Ringold_Formation

    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]

  9. Columbia Basin Project - Wikipedia

    en.wikipedia.org/wiki/Columbia_Basin_Project

    These flood basalts are exposed in some places, while in others they are covered with thick layers of loess. During the last ice age glaciers shaped the landscape of the Columbia River Plateau. Ice blocked the Columbia River near the north end of Grand Coulee, creating glacial lakes Columbia and Spokane.