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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 ocean floor with basalt lava. Many flood basalts have been attributed to the onset of a hotspot reaching the surface of the Earth via a mantle plume . [ 2 ]
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]
Ultrapotassic lamprophyre dikes can also be found along the basin flanks, which are highly unusual in the Rocky Mountain region. The site of the Raton Basin was a coastal plain at the end of Cretaceous and beginning of Paleogene time, and has a well-preserved sequence of rocks spanning the Cretaceous–Paleogene boundary.
It flows westward along the county line between Pitkin and Eagle County. Below Meredith, it is dammed to form the Ruedi Reservoir. It joins the Roaring Fork below Basalt. A portion of the river's water is diverted to the east side of the continental divide for irrigation and drinking water via the Fryingpan-Arkansas Project.
Columbia River Basalt Group [g] Chilcotin Plateau Basalts [e] Increased Antarctic deep waters Yellowstone hotspot Nördlinger Ries (14.5-14.3) Burdigalian: 20.44 Aquitanian: 23.03 * Shield volcanoes of Ethiopia [h] Antarctic ice sheet complete Paleogene: Oligocene: Chattian: 28.1 Ethiopian and Yemen traps (31–30) [h] Fish Canyon Tuff (27.51 ...
The location of the State of Colorado in the United States of America. The Gunnison River in the Black Canyon. This is a list of drainage basins in the U.S. State of Colorado. Colorado encompasses the headwaters of several important rivers.
Within the lower part of the Cardenas Basalt, the basaltic lavas are highly fractured and weather into rubble that is about 10 to 30 cm (3.9 to 11.8 in) in diameter. The lava within this unit consists of pahoehoe lava flows of olivine-rich basalt. Within the lower part of the Cardenas Basalt, the lava is highly altered and might have been ...
Lava flows from the Uinkaret volcanic field that have cascaded down into the Grand Canyon, damming the Colorado River, have been used to date the canyon's carving. [3] One of these cascades is today's Lava Falls. Lava Falls Rapid, below Lava Falls on the Colorado River, is "at all water levels, the most severe rapid in Grand Canyon." [4]