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Fort Rock Volcanic Field volcano

Maar(s) 1712 m / 5617 ft
Oregon, United States, 43.39°N / -121.14°W
Current status: (probably) extinct (0 out of 5) | Reports
Fort Rock Volcanic Field volcano books
Typical eruption style: unspecified
Fort Rock Volcanic Field volcano eruptions: None during the past 10,000 years
Less than few million years ago (Pleistocene) No recent earthquakes
TimeMag. / DepthDistanceLocation

Background:

A large group of tuff rings, tuff cones, and maars occupies the Fort Rock-Christmas Lake Valley basin S of Newberry volcano. The 64 x 40 km basin was occupied a Pliocene to late-Pleistocene lake, through which eruptions of basaltic magma occurred along faults cutting diagonally across the basin and adjacent highland. The volcanic field is named for Fort Rock, a spectacular wave-cut tuff ring that was breached by wave erosion. The Table Rock tuff ring and maar complex lies at the SE end of the field. Spectacular maars such as Hole-in-the-Ground and Big Hole are located near Gighway 31. Hole-in-the-Ground was formed as recently as between 13,500 and 18,000 years ago.
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Source: Smithsonian / GVP volcano information


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