Linear tracts and small patches of well rounded and varnished pebbles and cobbles mark the traces of ancient channels, bars, and floodplain terraces of the lower Colorado River.
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Varnished Colorado River gravel on ancient terrace surface
Linear tracts and small patches of well rounded and varnished pebbles and cobbles mark the traces of ancient channels, bars, and floodplain terraces of the lower Colorado River.
Extreme soft-sediment deformation in the Bouse Formation in CA
Deformed sediment of the Bouse Formation in Chemehuevi Valley, California. Complex deformation is a likely consequence of subaqueous mass wasting of part of a growing delta of the Colorado River.
Deformed sediment of the Bouse Formation in Chemehuevi Valley, California. Complex deformation is a likely consequence of subaqueous mass wasting of part of a growing delta of the Colorado River.
Sediments of the Bouse Formation in Chemehuevi Valley, California
Outcrop of the Bouse Formation in Chemehuevi Valley, Whipple Mountains, Calfornia in background. The Bouse Formation includes sedimentary deposits that chronicle the first arrival of Colorado River water into desert basins downstream from Grand Canyon. The deposits in Chemehuevi Valley are particularly well-exposed.
Outcrop of the Bouse Formation in Chemehuevi Valley, Whipple Mountains, Calfornia in background. The Bouse Formation includes sedimentary deposits that chronicle the first arrival of Colorado River water into desert basins downstream from Grand Canyon. The deposits in Chemehuevi Valley are particularly well-exposed.
Surficial Geologic Mapping in the northern Bristol Mountains, CA
USGS geologic mappers walkinbg out an intermediate age (likely middle Pleistocene) alluvial fan surface near Broadwell Mesa, in the northern Bristol Mountains, Kelso Dunes Wilderness Area, Mojave Desert, California.
USGS geologic mappers walkinbg out an intermediate age (likely middle Pleistocene) alluvial fan surface near Broadwell Mesa, in the northern Bristol Mountains, Kelso Dunes Wilderness Area, Mojave Desert, California.
Western Columbia River Gorge, Columbia River Gorge Nat'l Scenic Area
A view west of the western Columbia River Gorge National Scenic Area from near Cascade Locks, Oregon. The toe of the Bonneville landslide is on the right, which blocked the Columbia River about 500 years ago.
A view west of the western Columbia River Gorge National Scenic Area from near Cascade Locks, Oregon. The toe of the Bonneville landslide is on the right, which blocked the Columbia River about 500 years ago.
Strikingly orange-tinted flow of the Colorado River in Granite Gorge
Summer flash-floods can introduce large amounts, of fine reddish-orange sediment to the Colorado River with spectacular results
Summer flash-floods can introduce large amounts, of fine reddish-orange sediment to the Colorado River with spectacular results
Freshwater tidal marshes of the Columbia River estuary, Oregon
Freshwater tidal marsh of the Columbia River estuary, Cathlamet Bay in foreground, uplifted coastal ranges of the Cascadia forearc of Washington in background.
Freshwater tidal marsh of the Columbia River estuary, Cathlamet Bay in foreground, uplifted coastal ranges of the Cascadia forearc of Washington in background.
UICC Asbestos Anthophyllite Standard
Union for International Cancer Control (UICC) Asbestos Anthophyllite Standard.
Union for International Cancer Control (UICC) Asbestos Anthophyllite Standard.
UICC Asbestos Chrysotile 'B' Standard
Union for International Cancer Control (UICC) asbestos chrysotile 'B' standard.
Union for International Cancer Control (UICC) asbestos chrysotile 'B' standard.
UICC Asbestos Chrysotile 'A' Standard
Union for International Cancer Control (UICC) asbestos chrysotile 'A' standard.
Union for International Cancer Control (UICC) asbestos chrysotile 'A' standard.
UICC Asbestos Crocidolite Standard
Union for International Cancer Control (UICC) asbestos crocidolite standard.
Union for International Cancer Control (UICC) asbestos crocidolite standard.
Physiographic image of Cascadia
Physiographic image of the Pacific Northwest, modified from USGS I-2689 by Haugerud (2004) Physiographic-Cascadia
Physiographic image of the Pacific Northwest, modified from USGS I-2689 by Haugerud (2004) Physiographic-Cascadia
Physiographic Cascadia
Cascadia encompasses the volcanoes of the Cascade Range and the subduction zone that feeds them. The region is home to nearly 10 million people. Where and how these people live, work, and play are influenced by the shape, or physiography, of Cascadia. This map is a tool for visualizing and interpreting the physiography of Cascadia.
Cascadia encompasses the volcanoes of the Cascade Range and the subduction zone that feeds them. The region is home to nearly 10 million people. Where and how these people live, work, and play are influenced by the shape, or physiography, of Cascadia. This map is a tool for visualizing and interpreting the physiography of Cascadia.
View of California from above NW Mexico
Oblique orbital view of California looking NNW from above NW Sonora, Mexico, and northern Gulf of California
Oblique orbital view of California looking NNW from above NW Sonora, Mexico, and northern Gulf of California
Oil well pumping unit, south area of the La Honda oil field, CA
The south area of the La Honda oil field, California, was discovered during the late 1950s and produced an estimated 595,000 barrels of oil from about 12 wells, including the well in this photo.
The south area of the La Honda oil field, California, was discovered during the late 1950s and produced an estimated 595,000 barrels of oil from about 12 wells, including the well in this photo.
San Gorgonio Pass landscape: land of geologic complexity
Photograph from summit of San Jacinto Peak looking north across San Gorgonio Pass toward San Gorgonio Mountain. San Gorgonio River and Interstate Highway 10 traverse the Pass lowland; the Whitewater River drains the San Bernardino Mountains and flows eastward into the Salton Trough.
Photograph from summit of San Jacinto Peak looking north across San Gorgonio Pass toward San Gorgonio Mountain. San Gorgonio River and Interstate Highway 10 traverse the Pass lowland; the Whitewater River drains the San Bernardino Mountains and flows eastward into the Salton Trough.