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Encyclopedia > Columbia River Plateau
The Columbia River Plateau is shown in green on this map. The Washington towns of Spokane, Vantage, Yakima and Pasco, and the Oregon town of Pendleton, lie on the Columbia River Plateau.

The Columbia River Plateau lies across parts of the U.S. states of Washington, Oregon, and Idaho. During late Miocene and early Pliocene times, one of the largest flood basalts ever to appear on the earth's surface engulfed about 63,000 square miles (160,000 km²) of the Pacific Northwest, forming a large igneous province (the Columbia River Basalt Group). Over a period of perhaps 10 to 15 million years lava flow after lava flow poured out, eventually accumulating to a thickness of more than 6,000 feet (1.8 km). As the molten rock came to the surface, the earth's crust gradually sank into the space left by the rising lava. The subsidence of the crust produced a large, slightly depressed lava plain now known as the Columbia Basin or Plateau. The ancient Columbia River was forced into its present course by the northwesterly advancing lava. The lava, as it flowed over the area, first filled the stream valleys, forming dams that in turn caused impoundments or lakes. In these ancient lake beds are found fossil leaf impressions, petrified wood, fossil insects, and bones of vertebrate animals. Image File history File links Download high resolution version (455x700, 27 KB)USGS map of volcanic areas in US Pacific Northwest File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Download high resolution version (455x700, 27 KB)USGS map of volcanic areas in US Pacific Northwest File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Federal courts Supreme Court Chief Justice Associate Justices Elections Presidential elections Midterm elections Political Parties Democratic Republican Third parties Libertarian Party State & Local government Governors Legislatures (List) State Courts Counties, Cities, and Towns Other countries Politics Portal      A U.S. state is any one of the fifty subnational entities of... Official language(s) English Capital Olympia Largest city Seattle Area  Ranked 18th  - Total 71,342 sq mi (184,827 km²)  - Width 240 miles (385 km)  - Length 360 miles (580 km)  - % water 6. ... Official language(s) None Capital Salem Largest city Portland Area  Ranked 9th  - Total 98,466 sq mi (255,026 km²)  - Width 260 miles (420 km)  - Length 360 miles (580 km)  - % water 2. ... This article or section does not adequately cite its references or sources. ... The Miocene Epoch is a period of time that extends from about 23. ... The Pliocene epoch (spelled Pleiocene in some older texts) is the period in the geologic timescale that extends from 5. ... fgxhtdfhfghfghgfhfgfffffffffffffffffffffffffffggggggggggggggggggggggggghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhflood basalt. ... Adjectives: Terrestrial, Terran, Telluric, Tellurian, Earthly Atmosphere Surface pressure: 101. ... A large igneous province (LIP) is an extensive region of basalts resulting from flood basalt volcanism. ... The Columbia River Basalt Group encompasses portions of 3 states. ... Monte Roraima In geology and earth science, a plateau, also called a high plateau or tableland or chodechugger, is an area of highland, usually consisting of relatively flat open country. ... The Columbia River (French: fleuve Columbia) is a river situated in British Columbia and the Pacific Northwest of the United States. ... Three small ammonite fossils, each approximately 1. ... Petrified log at the Petrified Forest National Park A petrified tree from California Petrified wood is a type of fossil: it consists of fossil wood where all the organic materials have been replaced with minerals (most often a silicate, such as quartz), while retaining the original structure of the wood. ...

Portions of this article adapted from works of the United States Government, which are in the public domain A work of the United States Government is, as defined by United States copyright law, a work prepared by an officer or employee of the United States Government as part of that persons official duties. ... The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ...

See also

The Grand Coulee The Grand Coulee is an ancient river bed in the U.S. state of Washington. ... DrumHeller Channels The Channeled Scablands are unique geological erosion features in the U.S. state of Washington. ... The Interior Plateau comprises a large region of central British Columbia, and lies between the Cariboo and Monashee Mountains on the east, and the Hazelton Mountains, Coast Mountains and Cascade Range on the west. ...

External links

  • USGS Page on Columbia Plateau
  • Geology of Lake Roosevelt National Recreation Area (source of much of this page)

  Results from FactBites:
Columbia River - Wikipedia, the free encyclopedia (1438 words)
The Columbia River is a river situated in British Columbia and the Pacific Northwest of the United States.
Columbia River, Revelstoke, BC Columbia Lake forms the Columbia's headwaters in the Canadian Rockies of southern British Columbia.
The exterior river boat scenes from the 1994 film Maverick (Mel Gibson, Jodie Foster, and James Garner), were shot on the Columbia River, in the Columbia River Gorge, near the town of Hood River.
Columbia River Flood Basalt Province, Idaho, Washington, Oregon, USA (705 words)
The Paso Basin is near the confluence of the Columbia and Snake Rivers.
The Columbia River Flood Basalt Province forms a plateau of 164,000 square kilometers between the Cascade Range and the Rocky Mountains.
hot spots and the Yellowstone hot spot may have influenced magma generation for the Columbia River flood basalt but the vents were 300-400 km north of the hot spot track and the chemistry of the basalts suggest a source in the lithospheric mantle not the asthenosphere as expected for hot spot magmas.
  More results at FactBites »



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