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Geologic Formation Attractions In Fort Rock

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Fort Rock is a volcanic landmark called a tuff ring, located on an ice age lake bed in north Lake County, Oregon, United States. The ring is about 4,460 feet in diameter and stands about 200 feet high above the surrounding plain. Its name is derived from the tall, straight sides that resemble the palisades of a fort. The region of Fort Rock-Christmas Lake Valley Basin contains about 40 such tuff rings and maars and is located in the Brothers Fault Zone of central Oregon's Great Basin. William Sullivan, an early settler in the area, named Fort Rock in 1873 while searching for lost cattle.
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Geologic Formation Attractions In Fort Rock

  • 1. Hole-in-the-Ground Fort Rock
    Hole-in-the-Ground is a large maar in the Fort Rock Basin of Lake County, central Oregon, northeast of Crater Lake, near Oregon Route 31.It is about 1.0 mile across, a little longer N-S than E-W. Its floor is about 150 meters below the surrounding ground level and has a rim that rises 35 to 65 meters above, the highest point on the east side. The crater formed during the late Pleistocene, between 13,500 and 18,000 years ago, at which time the Fort Rock Basin was a lake and the location was near the shore. Basaltic magma intruding near the surface flashed ground water to steam, which blew out overlying rock and soil, along with some juvenile material. As material slid into the hole formed, it closed the vent and the process repeated, eventually forming the huge hole. Blocks as large as 26 f...
    From Wikipedia, the free encyclopedia.

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