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| Coso Plain | |
|---|---|
| Name | Coso Plain |
| Location | Inyo County, California, United States |
| Coordinates | 36°N 117°W (approx.) |
| Region | Eastern Sierra Nevada, Mojave Desert |
| Highest point | Argus Range (nearby) |
| Area | ~200–400 km² (approx.) |
Coso Plain The Coso Plain lies at the eastern margin of the Sierra Nevada within Inyo County, California, adjacent to the Owens Valley and the Mojave Desert. It is framed by the Coso Range, the Argus Range, and the China Lake region, and is notable for volcanic landforms, geothermal activity, and extensive Native American rock art. The plain occupies a crossroads near routes to Bishop, California, Ridgecrest, California, and Death Valley National Park.
The plain sits within the broader physiographic context of the Great Basin and the California Basin and Range Province, lying northeast of the Sierra Nevada and west of the Mojave Desert National Preserve. Nearby geographic features include the Owens Lake, the Panamint Range, the White Mountains (California) and the Panamint Valley. Transportation and infrastructure corridors in the region link to U.S. Route 395, California State Route 14, and the Southern Pacific Transportation Company rail corridors historically serving Bodie, California and Randsburg, California. Federal jurisdictions bordering the plain include Bureau of Land Management lands, Naval Air Weapons Station China Lake, and holdings associated with the United States Fish and Wildlife Service.
The plain overlies parts of the Coso Volcanic Field and is underlain by Miocene to Quaternary volcanic and plutonic rocks related to the tectonic evolution of the Walker Lane belt and the Eastern California Shear Zone. Regional magmatism is tied to interactions between the Pacific Plate and the North American Plate, with linkages to the broader San Andreas Fault system and the Garlock Fault. Igneous bodies include rhyolitic domes and obsidian flows comparable to deposits found at Obsidian Butte, while regional metamorphic and basement rocks correlate with the Sierra Nevada Batholith and the Mojave Desert metamorphic core complexes. Geophysical studies reference seismicity patterns akin to those observed near Lassen Peak, Long Valley Caldera, and Salton Trough geothermal provinces.
The Coso Plain experiences an arid to semi-arid climate influenced by the rain shadow of the Sierra Nevada and the elevation gradients toward the Inyo Mountains. Vegetation communities include creosote bush scrub similar to those in Mojave National Preserve, saltbush scrub like stands near Mono Lake margins, and patches of pinyon-juniper woodland found elsewhere in Inyo National Forest. Fauna recorded in adjacent habitats include species managed by California Department of Fish and Wildlife such as bighorn sheep linked to populations in the Panamint Range, mule deer common to Owens Valley, and raptors monitored by Audubon Society chapters in the region. Climatic influences are comparable to those shaping Death Valley National Park and Red Rock Canyon National Conservation Area.
Indigenous populations used the plain for millennia, with cultural connections to the Coso people and neighboring Northern Paiute, Shoshone and Kawaiisu groups documented by archaeologists from institutions such as the Smithsonian Institution, University of California, Berkeley, and University of California, Los Angeles. Rock art panels, including petroglyphs, resemble motifs found at Petroglyph National Monument and Newspaper Rock State Historic Monument. Euro-American exploration and settlement in the 19th century linked the plain to California Gold Rush migration routes and to military outposts like Fort Tejon and supply centers such as Benton Station. In the 20th century, federal programs including those of the Bureau of Indian Affairs and the National Park Service engaged in cultural resource management across the area.
The region’s volcanic field hosts rhyolitic domes, tuff deposits, and obsidian exposures similar in origin to those at Mono-Inyo Craters and Valles Caldera. Geothermal exploration and development involved companies and agencies such as CalEnergy, Enel Green Power, and the U.S. Department of Energy, and has produced electrical generation tied to technologies promoted by the Geothermal Resources Council and research conducted at Lawrence Livermore National Laboratory and Sandia National Laboratories. Seismic swarms recorded in the area have been studied in comparison with events at Mount St. Helens, Yellowstone Caldera, and Kīlauea. Hydrothermal alteration and fumarolic activity have implications for mineralization analogous to occurrences at Mercury, Nevada and Cortez Gold Mine districts.
Land uses on and around the plain mix federal, tribal, and military designations. The Naval Air Weapons Station China Lake controls significant tracts used for ordnance testing, overlapping zones managed by the Bureau of Land Management for multiple uses and recreation similar to policies in Red Rock Canyon NCA. Energy development, including geothermal leases administered under Bureau of Land Management and U.S. Bureau of Reclamation water infrastructure in the greater Owens Valley, has involved private firms like Calpine and regulatory oversight by the California Energy Commission. Public access is regulated with parallels to access regimes at Joshua Tree National Park and Mojave National Preserve; archaeological sites are protected under statutes enforced by the National Historic Preservation Act and monitored by tribal authorities including the Northern Paiute Tribe and Native American Heritage Commission.
Conservation concerns around the plain intersect with species protection efforts led by the U.S. Fish and Wildlife Service, habitat restoration projects funded by the California Department of Fish and Wildlife, and cultural preservation initiatives involving the National Trust for Historic Preservation. Impacts from groundwater pumping affecting Owens Lake dust regulation programs, invasive plant management similar to efforts in Anza-Borrego Desert State Park, and the environmental review processes under the National Environmental Policy Act have influenced policy decisions. Collaborative stewardship often involves partnerships among tribal governments, federal agencies like the Bureau of Land Management, academic partners such as California State University, Bakersfield, and conservation NGOs including The Nature Conservancy.
Category:Landforms of Inyo County, California