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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.
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."
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]
The pit, like the more than 200 others discovered up there, was created by the collapse of a lava tube. ... Most of the pits seem to be located in the moon’s ancient lava plains, according to ...
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 ...