This sign is located on U.S. Hwy. 395 about 9 miles north of Valley Falls.
Marker Name: Abert Rim
Marker Text: 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.
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