Orocopia Mountains

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Orocopia Mountains
Orocopia Mountains.JPG
Orocopia Mountains
Highest point
Elevation 1,117 m (3,665 ft)
Geography
Relief map of California.png
Red triangle with thick white border.svg
Orocopia Mountains
location of Orocopia Mountains in California [1]
CountryUnited States
StateCalifornia
District Riverside County
Range coordinates 33°34′00″N115°46′33″W / 33.56667°N 115.77583°W / 33.56667; -115.77583
Topo map USGS  Orocopia Canyon

The Orocopia Mountains are located in Riverside County in southern California, United States, east of the Coachella Valley, west of the Chuckwalla Mountains, and south of Interstate 10 in the Colorado Desert. The range lies in an east-west direction, and is approximately 18 miles long. The Orocopia Mountains are north of and overlooking the Salton Sea and south of Joshua Tree National Park, with the Chocolate Mountains to the southeast and the scenic Mecca Hills just northwest.

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Orocopia Mountains Wilderness

Location of the Orocopia Mountains Wpdms shdrlfi020l little san bernardino mountains.jpg
Location of the Orocopia Mountains

The area is the Bureau of Land Management (BLM) designated and managed Orocopia Mountains Wilderness. [2] The Orocopia Mountains are in the Colorado Desert section of the Sonoran Desert, adjacent to the Lower Colorado River Valley region. Just to the north is the Mecca Hills Wilderness Area.

Flora and fauna

The Wilderness Area includes some remnant natural spring fed oasis with the only California native palm, Washingtonia filifera or the California Fan Palm.

History

The Bradshaw Trail passed through the mountains, the first recorded route to the Colorado River from Riverside, California.

Geology

The dramatic and variable terrain was shaped primarily by movements of the adjacent San Andreas Fault over millennia. Most notably, the Orocopia schist, a blueschist assemblage found in the range, matches the Pelona schist found over 250 km away in the San Gabriel Mountains along the San Andreas fault. Hill and Dibblee (1953) first noted this similarity (a piercing point), and used it to construct the first estimates of the offset on the fault. [3]

Astronaut training

The Orocopia Mountains offer considerable geologic variety and was one of the areas used for geologic field training by Caltech Professor of Geology, Leon T. Silver, for astronauts in preparation for the NASA Project Apollo Moon landing missions. This training included: [4]

See also

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References

  1. "Orocopia Mountains". Geographic Names Information System . United States Geological Survey, United States Department of the Interior . Retrieved 2009-05-04.
  2. http://www.blm.gov/ca/pa/wilderness/wa/areas/orocopia_mountains.html Archived 2007-04-06 at the Wayback Machine . accessed 6/20/2010
  3. "Geology and plate tectonic development: Displacement of basement rocks".
  4. "Geologic Field Training of NASA Astronauts Between January 1963 and November 1972" (PDF). Retrieved 2007-03-20.