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Three Fingered Jack volcano

Shield(s) 2390 m / 7841 ft
Oregon, United States, 44.48°N / -121.84°W
Current status: (probably) extinct (0 out of 5) | Reports
Three Fingered Jack volcano books
Typical eruption style: unspecified
Three Fingered Jack volcano eruptions: None during the past 10,000 years
Less than few million years ago (Pleistocene) No recent earthquakes
TimeMag. / DepthDistanceLocation


Three Fingered Jack is a distinctive deeply eroded basaltic andesite shield volcano that forms the highest peak between Mt. Jefferson and the Three Sisters. A pyroclastic cone buttressed by radial dikes forms its sharp-ridged summit. Other Pleistocene shield volcanoes and cinder cones are found to the NW and SW, and Hogg Rock Butte near Santiam Pass is a tuya formed during subglacial eruptions. The Maxwell Butte shield volcano SW of Three Fingered Jack is less eroded, and erupted between about 80,000 and 40,000 years before present.
Source: Smithsonian / GVP volcano information

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