Fort Rock, Tuff ring in Lake County, Oregon, US
Fort Rock stands 200 feet high above the surrounding plain, forming a circular volcanic formation with steep walls measuring 4,460 feet in diameter.
William Sullivan discovered and named Fort Rock in 1873 while searching for lost cattle in the region of central Oregon's Great Basin.
Archaeological discoveries in Fort Rock Cave include ancient sagebrush sandals and artifacts dating back 9,000 to 10,000 years, indicating early human presence.
The formation contains hiking trails that lead visitors through geological features, allowing direct observation of the volcanic layers and rock formations.
The structure formed when basalt magma met lake bottom mud, creating steam eruptions that scattered lava and ash to create a saucer-shaped ring.
Location: Lake County
GPS coordinates: 43.37208,-121.07400
Latest update: May 11, 2025 12:41
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