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From Wikipedia, the free encyclopedia
Big Southern Butte is the largest and youngest (300,000 years old) of three rhyolitic domes formed over a million years near the center of the Eastern Snake River Plain in the U.S. state of Idaho.[5] It is one of the largest volcanic domes on earth.[4] It rises approximately 2500 vertical feet (762 m) above the lava plain in southern Butte County, east of Craters of the Moon National Monument.
Big Southern Butte | |
---|---|
Highest point | |
Elevation | 7,550 ft (2,300 m)[1] |
Prominence | 2,380 ft (730 m)[2] |
Coordinates | 43°24′05″N 113°01′26″W[3] |
Geography | |
Location | Butte County, Idaho, United States |
Topo map | USGS Big Southern Butte |
Geology | |
Age of rock | 300,000 years[4] |
Mountain type | Lava dome |
Designated | 1976 |
Big Southern Butte consists of two coalesced lava domes with a base diameter of 6.5 kilometres (4.0 mi) and a combined volume of approximately 8 cubic kilometres (1.9 cu mi).[6]
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