Search results
Results From The WOW.Com Content Network
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 is an important geologic and geographic region that lies across parts of the U.S. states of Washington, ... lava flow after lava flow poured out, ...
This flow may have been part of a lava lake the size of Lake Superior. [13] Deep erosion of flood basalts exposes vast numbers of parallel dikes that fed the eruptions. [17] Some individual dikes in the Columbia River Plateau are over 100 kilometers (60 mi) long. [16]
The Columbia Plateau province is enveloped by one of the world's largest accumulations of basalt. Over 500,000 km 2 (190,000 sq mi) of the Earth's surface is covered by it. The topography here is dominated by geologically young lava flows that inundated the countryside with amazing speed, all within the last 17 million years. [8]
During the basalt eruptions, the southern and western Columbia Plateau, which included the current location of the Wallula Gap, began to fold. The bending (or shear) of the ancient lava flows is clearly visible in the folded layers of basalt exposed in the steep walls of the gap. [3] [4]
The Columbia Plateau covers part of three states. The Columbia Plateau province is enveloped by one of the world's largest accumulations of lava. Over 500,000 km 2 (190,000 sq mi) of the Earth's surface is covered by it, an area roughly the size of the country of Spain. The topography here is dominated by geologically young lava flows that ...
Grand Coulee is a large coulee on the Columbia River Plateau.This area has underlying granite bedrock, formed deep in the Earth's crust 40 to 60 million years ago. The land periodically uplifted and subsided over millions of years giving rise to some small mountains and, eventually, an inland sea.
Chilcotin Plateau Basalts [e] Tortonian: 11.62 * Serravallian: 13.82 * Langhian: 15.97 M. Miocene disruption (14.8–14.5) [f] 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 ...