Roadside information sign describing geological fault line, visible in photo background, as a scarp slope topped by a cliff.
Oregon Geology roadside sign describing Abert Rim, the 760-meter-high (2,500 ft) fault scarp (photo background), formed during the Miocene Period by block faulting. The 250m (800 ft) sheer-sided basalt cap also forms the bed of Lake Abert on the adjacent block to the west. Hwy 31, Valley Falls, Lake County, Oregon. Sign type transcribed: OREGON GEOLOGY ABERT RIM DISCOVERED BY CAPTAIN JOHN C. FREMONT DECEMBER 20, 1843 AND NAMED IN HONOR OF COLONEL J. J. ABERT. ABERT RIM SOME 2500 FEET ABOVE THE VALLEY FLOOR IS ONE OF THE HIGHEST FAULT SCARPS IN THE UNITED STATES. THIS BASALT FORMATION, A BASIC LAVA COVERING MUCH OF EASTERN OREGON, ISSUED FROM GREAT FISSURES DURING THE MIOCENE PERIOD OF GEOLOGIC HISTORY MANY MILLIONS OF YEARS AGO. AFTER THIS EXTENSIVE LAVA FLOODING, THE EARTH'S CRUST WAS FRACTURED AT MANY POINTS AND GREAT BLOCKS WERE TILTED. ABERT RIM IS THE WESTERN EDGE OF ONE OF THESE TILTED BLOCKS WHILE ABERT LAKE LIES ON TOP OF ANOTHER.
Size: 5100px × 3394px
Location: Highway 31, Valley Falls, Lake County, Oregon, USA
Photo credit: © Andrew Haliburton / Alamy / Afripics
License: Licensed
Model Released: No
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