Fort Rock in Lake County, Oregon — The American West (Northwest)
Oregon Geology and History
Fort Rock is the remnant of a maar volcano or tuff ring, formed when rising basaltic magma encountered water and exploded violently. The exploded debris – called tuff – fell back to earth around the volcanic vent to form this steep-walled, fort-like ring. Over time, the basin filled with a shallow lake, which breached the south rim of the tuff ring and cut a terrace about 60 feet above the floor of the valley. A State Monument and a National Natural Landmark, Fort Rock is one of several maars in the area; other examples are Hole-in-the-Ground, Table Rock, Flat Top, and Big Hole. Look ahead of you to the east for a view of Fort Rock in the distance.
Erected by State of Oregon.
Marker series. This marker is included in the Oregon Beaver Boards marker series.
Location. 43° 21.33′ N, 121° 10.866′ W. Marker is in Fort Rock, Oregon, in Lake County. Marker is on Oregon Route 31 south of Old Fort Rock Road, on the left when traveling south. Touch for map. Marker is located in a pull-out on the east side of the highway, overlooking Fort Rock in the distance. Marker is at or near this postal address: 74543 Oregon Highway 31, Fort Rock OR 97735, United States of America.
Other nearby markers. At least 8 other markers are within Reuban A. "Reub" Long (approx. 5.9 miles away); a different marker also named Fort Rock (approx. 5.9 miles away); Fort Rock State Park (approx. 5.9 miles away); Cowboy, Horseman, Philosopher (approx. 5.9 miles away); The First People of Fort Rock (approx. 5.9 miles away); The Birth of a Tuff Ring (approx. 5.9 miles away); Claiming the Desert (approx. 6.2 miles away); Home Sweet Home (approx. 6.2 miles away). Touch for a list and map of all markers in Fort Rock.
Also see . . .
1. Fort Rock Cave.
Fort Rock Cave is located in a small volcanic butte approximately half a mile west of the Fort Rock volcanic crater in northern Lake County. Near the end of the Pleistocene, a massive lake filled the Fort Rock Basin, and erosion from wind-driven waves carved the cave about seventy-five feet deep into soft rock. In 1938, University of Oregon archaeologist Luther Cressman excavated at Fort Rock Cave, where he and his crew found dozens of sandals below a layer of volcanic ash, subsequently determined to have come from the 7,600-year-old eruption of Mount Mazama. (Submitted on February 2, 2018, by Cosmos Mariner of Cape Canaveral, Florida.)
2. Fort Rock Sandals.
Fort Rock sandals are a distinctive type of ancient fiber footwear found in southeast Oregon and northern Nevada. Archaeologist Luther Cressman first found examples in Oregon’s Fort Rock Cave. Fort Rock-style sandals have (Submitted on February 2, 2018, by Cosmos Mariner of Cape Canaveral, Florida.)
Categories. • Animals • Native Americans • Natural Features •
Credits. This page was last revised on February 3, 2018. This page originally submitted on February 2, 2018, by Cosmos Mariner of Cape Canaveral, Florida. This page has been viewed 54 times since then. Photos: 1, 2, 3, 4, 5, 6. submitted on February 2, 2018, by Cosmos Mariner of Cape Canaveral, Florida. • Andrew Ruppenstein was the editor who published this page.