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Signs! A
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Oregon
Geology - Abert Rim Marker
Location
of sign - Abert Lake and Abert Rim are located in the South-central
area of Oregon in Lake County, about 30 miles north of Lakeview, on
the west side of the Highway on US Route 395.
Photo
taken - June 2004
Photo
courtesy of Barb Tharp
Text
of sign:
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.
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