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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 Flat Tops is a mountain range located in Colorado within the Routt and White River National Forests. [1] Much of the range is within the boundary of the Flat Tops Wilderness Area . While there are notable peaks in the Flat Tops, the dominant feature of the range is the high plateau from which the peaks arise.
Throughout Colorado's geologic history, rocks have often been deformed, metamorphosed and overprinted, obscuring the ancient record. Beginning 1.7 billion years ago granite and pegmatite intruded. The Routt Plutonic Suite is dated to 1.66 to 1.79 billion years old and is an important rock formation in Rocky Mountain National Park and Buffalo ...
Three prominent, columnar jointed, cliff-forming lava flows can be seen on North Table Mountain, one exposed part way up the northwest slope, and two that form its cap. The Ralston Dike, a body of intrusive monzonite located about 2 miles (3.2 km) to the northwest, probably represents the volcanic vent from which the flows erupted. [ 6 ]
Basalt columns seen on Porto Santo Island, Portugal. Columnar jointing of volcanic rocks exists in many places on Earth. Perhaps the most famous basalt lava flow in the world is the Giant's Causeway in Northern Ireland, in which the vertical joints form polygonal columns and give the impression of having been artificially constructed.
An erosion surface on the Vishnu Basement Rocks is covered by sedimentary rocks and basalt flows, and these rocks formed in the interval from about 1250 to 750 million years ago: in turn, they were uplifted and split into a range of fault-block mountains.
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 ]
Rabbit Ears Pass (el. 9426 ft, 2873 m) is a high mountain pass in the Rocky Mountains of northern Colorado in the United States, where U.S. Route 40 crosses the Continental Divide. North of the summit is Rabbit Ears Peak which has the shape of rabbit ears, which displays two large columns of basalt rock formations from the second volcanic episode.