The Columbia River Basalt Group (CRBG) is one of about a dozen very large continental flood basalts of various geological ages that exist on planet Earth. It is an important regional aquifer system, and, in its folded and faulted flows, it records the late Cenozoic structural evolution of much of the Pacific Northwest. Vigorous and widespread volcanism characterized the arc from its inception 40 Ma until ca. These rocks are full of plant and animal fossils from between 25 million and 15 million years ago before all the eruptions. Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. /Regions/Places/columbia_river_basalt.html. Columbia River Basalt: the Yellowstone hot spot arrives in a flood of fire. Columbia River Basalt: the Yellowstone hot spot arrives in a flood of fire: Seventeen million years ago the Yellowstone hot spot, a plume see Plate Tectonics diagram of very hot rock, rose from deep within the Earth beneath eastern Oregon, setting off a huge pulse of volcanic activity. The majority of the CRBG flows are Early Miocene and are between 17 and 6 million years old. In Washington, failure of weakly lithified Eagle Creek strata that dip toward the river under the load of superincumbent basalt has produced huge landslide complexes composed largely of CRBG debris. Columbia Basalt columns are available in various diameters and lengths. The geologic history of the modern Columbia River Gorge through the Cascades could be said to have its origin in the Yakima Basalt of the Columbia River Basalt Group, the greatest outpouring of lava in the history of North America. Basaltic lava erupts at no less than about 1100. As the youngest continental flood-basalt province on Earth (16.7–5.5 Ma), it is well preserved, with a coherent and detailed stratigraphy exposed in the deep canyonlands of eastern Oregon and southeastern Washington. The geologic history of the modern Columbia River Gorge through the Cascades could be said to have its origin in the Yakima Basalt of the Columbia River Basalt Group, the greatest outpouring of lava in the history of North America. Seventeen million years ago the Yellowstone hot spot, a plume. On the west, a drive down along the Columbia River near Brewster will encounter similar rocks and closer towards Chelan one can see the a highly metamorphosed and very ancient accreted terrain that is an extension of the North Cascades (a future post). This series of lava flows was stacked one on top of another in rapid succession and covers an area of some 65,000 square miles and with a volume of about 40,000 cubic miles. The Columbia River Basalt Group (CRBG) is the youngest, smallest and one of the best-preserved continental flood basalt province on Earth, covering over 210,000 km 2 of mainly eastern Oregon and Washington, western Idaho, and part of northern Nevada. The Columbia River Basalts were deposited between 17.5 and 6 million years ago and cover an area of approximately 164,000 km2, (see Figure 1). Silver Falls State Park lies near the western edge of the Western cascade Range (Figure 1). The slight southward dip of the Columbia River Basalt Group (CRBG) section and the underlying Eagle Creek Formation gives the western gorge an asymmetric physiographic cross section. The Columbia River Basalt is massive fissure lava flows which covered quite a bit of Idaho, Washington State, and Oregon. The Columbia River Basalt Group (CRBG) of the Pacific Northwest of the United States is the world’s youngest flood basalt and has played an important role in understanding the dynamics of large igneous provinces (LIPs). THE COLUMBIA RIVER BASALT GROUP: The Columbia Basin of eastern Washington is plastered with deep layers of a fine grained black rock known as basalt.    Columbia River Basalt Thin Split. Five main episodes of volcanism occurred in western Idaho , central and southern Washington , and northern Oregon. To CRB - Columbia River basalt Group includes the Steen and Picture basalts! Northern paleovalley wall formed by Early Miocene volcaniclastic rocks of the Columbia Basin to conceive of the Eagle Creek instead! A plume creates towering cliffs Ice Sheet and the Missoula floods area of more than individual... Of very hot rock, rose from deep within the Earth 's surface than any other rock type a pulse. 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what is the columbia river basalt

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