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Sinker Butte volcano

Shield 1012 m / 3320 ft
Idaho, United States, 43.25°N / -116.62°W
Current status: (probably) extinct (0 out of 5) | Reports
Sinker Butte volcano books
Typical eruption style: unspecified
Sinker Butte volcano eruptions: None during the past 10,000 years
Less than few million years ago (Pleistocene) No recent earthquakes
TimeMag. / DepthDistanceLocation


A Pleistocene shield volcano and tuff cone in the western Snake River Plain, Sinker Butte, is partially dissected by the Snake River Canyon. Lava flows from the tuff cone flowed up to 10 km to the south. A broad lava shield is overlain by a large tuff cone that is capped with lava flows and welded spatter. Ar-Ar dates of 1.25 and 1.17 Ma were obtained from basalts directly below phreatomagmatic tephra and capping basalts, respectively.
Source: Smithsonian / GVP volcano information

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