Unified Interior Regions

California

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Image: Sheared Reinforcement Bar
October 17, 1989

Sheared Reinforcement Bar

Sheared reinforcement bar, Cypress viaduct.

Pahoa Island in Mono Lake, California.
December 31, 1987

Pahoa Island in Mono Lake, CA.

This aerial view toward the south shows the northeastern side of Paoha Island in Mono Lake, California; the Mono Craters and Sierra Nevada are in the far distance. The north (bottom of photo) and east (left side of island) tips of the island consist of craters and lava flows that may have erupted as recently as A.D. 1720-1850.

Negit Island in Mono Lake, California....
December 31, 1987

Negit Island in Mono Lake, CA.

This high aerial view of Negit Island is toward the southwest. Three separate vents each erupted individual dacite lava flows to form three parallel elongate flows. The vents are located on the highest parts of the flows. The northwest edge of Paoha Island is visible in upper left.

Bishop Tuff formed from the eruption that created the Long Valley C...
October 29, 1987

Bishop Tuff formed from eruption that created the Long Valley Caldera

This outcrop is exposed in a rock quarry in Chalfant Valley about 25 km (15 mi) southwest of Long Valley Caldera. The two main units of the Bishop Tuff deposit are visible here: (1) the lower 5 m (16 f) of the section consists of the pumice that fell to the ground (airfall pumice) downwind from the eruption; and (2) the upper 5-6 m (16-20 f) of the section consists of the

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Aerial view of Inyo Craters, CA.
December 31, 1984

Inyo Craters, part of the Mono-Inyo Chain, Long Valley region, Ca

Inyo Craters, part of the Mono-Inyo Chain, Long Valley region, California.

Red Cones near Mammoth Mountain, viewed from the air toward the eas...
December 31, 1982

Red Cones near Mammoth Mountain, viewed from the air toward east-NE

The breach in the rims of both Red Cones cinder cones occurred when lava poured through the breaches and spilled about 1.5 km (1 mi) down the east valley wall of the Middle Fork of the San Joaquin River (to the left of this image).

Hummocky terrain of the debris avalanche north of Mount Shasta. ...
September 22, 1982

Hummocky terrain of the debris avalanche north of Mount Shasta.

Hummocky terrain of the debris avalanche north of Mount Shasta.

Coso Range geothermal well...
January 1, 1980

Coso Range geothermal well

First geothermal well drilled at Coso geothermal area, south-central California, by private industry. It, together with a few other wells, has been developed to feed steam into the initial powerplant. Photo from USGS Circular 1249.

Negit Island in Mono Lake, California.
December 31, 1978

Negit Island in Mono Lake, CA viewed toward the NW.

Negit Island in Mono Lake, California viewed toward the NW. The three parallel dacite lava flows that form the island are clearly visible.

Mount Konocti on the western shore of Clear Lake, California
December 31, 1975

Mount Konocti on the western shore of Clear Lake, California

Mount Konocti, a mostly dacitic composite cone, on the western shore of Clear Lake, California. Thurston Lake is in the foreground.

asbestos
December 31, 1969

Tremolite Asbestos

Tremolite asbestos, Death Valley, California.