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The largest of the Northern Basin and Range subregions, the High Lava Plains covers 10,262 square miles (26,578 km 2) in Oregon and 5,740 square miles (14,867 km 2) in Nevada, featuring a variety of land uses, including rangeland, wildlife habitat, irrigated pastureland and cropland, historic gold and silver mines, and active opal mines and ...
The Barrington Chert is finely laminated and has flaggy bedding. It is found in the Dial Range and Fossey Mountain Troughs, up to 1 km thick. The Motton Spilite lies on top of the chert. It consists of pillow lava, massive lava flows, sediments made from volcanic fragments, and chert breccia. The basalt is an ocean floor type.
The basaltic lava fields of Harrat Khaybar were formed by a series of eruptions over the course of 5 million years. These eruptions took place along a series of volcanic vents stretching over a 100-kilometer (62 mile) north-south linear vent system. The fields cover an area of approximately 12,000 km 2. [1]
In 1992, Coffin and Eldholm initially defined the term "large igneous province" as representing a variety of mafic igneous provinces with areal extent greater than 100,000 km 2 that represented "massive crustal emplacements of predominantly mafic (magnesium- and iron-rich) extrusive and intrusive rock, and originated via processes other than 'normal' seafloor spreading."
A Lava Flow without a Source: The Cohasset Flow and Its Compositional Members. The Journal of Geology, Volume 113, Pp 1 – 21. ISBN none. Web citations: "Southeast Oregon Basin and Range". SummitPost.org "Andesitic and basaltic rocks on Steens Mountain". USGS "Oregon: A Geologic History. 8.
Mount Edziza, a stratovolcano in northwestern British Columbia A topographic map of Canada, showing elevations shaded from green (lower) to brown (higher). Volcanic activity is a major part of the geology of Canada and is characterized by many types of volcanic landform, including lava flows, volcanic plateaus, lava domes, cinder cones, stratovolcanoes, shield volcanoes, submarine volcanoes ...
Lune River is a town in south-eastern Tasmania, Australia located near the mouth of a river of the same name. [2] It is home to some 24 people. [3]In the 1850s, much of the town's economic activity was based on timber mills, fishing and small-scale farming.
Extensive areas of nearly flat-lying lava flows throughout the Northern Cordilleran Volcanic Province can cover areas of at least 100 km 2 (39 sq mi) and are generally composed of highly-fluid basaltic lava. However, lava plains that pre-date the last glacial period have been eroded and overridden by glacial ice, affording a less distinctive ...