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Aerial view of the Salton Sea and Imperial Valley, California.
Aerial view of the Salton Sea and Imperial Valley, California. View towards the north.
Download ImageDendrites of manganese oxide
Manganese oxide (pyrolusite) dendrites on sandstone. This is the same material as desert varnish. (091214-1)
Download ImageUS-Mexico Border.
Aerial view of the Rio Grande River, that runs down the center of this photo, marking the US-Mexico Border. Juarez, Mexico lies on the left (south) side; El Paso, Texas, on the right (north). Note the contrast in architecture from one side to the other. (100128-112)
Download ImageView over Point Loma, California.
Aerial view over Point Loma to San Diego and San Diego Bay, California. (100128-69)
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San Francisco and Marin Headlands, California.
Aerial view of San Francisco north to Marin Headlands, California. (100128-32)
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Delta in alpine lake, British Columbia.
Delta forming in alpine lake, Yoho National Park, British Columbia, Canada (090910-43)
Download ImageDebris flow fan, N Montana.
Debris flow fan, northern Montana. Note the individual debris flow lobes as well as the channel. (O90908-18)
Download ImageGlacier, Yoho NP, Canada.
Glacier and headwall, Yoho National Park, British Columbia, Canada. Note the moraine in front of the present terminus. (090910-31)
Download ImageProterozoic stromatolites, Montana
Stromatolites in Helena Formation of Proterozoic Belt Supergroup, Glacier National park, Montana (090718-97)
Download ImageWaterfall and Hanging Valley, British Columbia
Takakkaw Falls, In Yoho National Park, British Columbia, Canada, falls over more than 1200 feet of sedimentary rock. Above it is a hanging valley, stranded above the main valley from glacial erosion during the Pleistocene. (090910-103)
Download ImageProterozoic Belt Supergroup, Montana (vertical)
Brown, Green, white, and red sedimentary strata, indicating different levels of oxidation of disseminated iron in the rock. Proterozoic Spokane Formation, Glacier National Park, Montana. (090718-41)
Download Imagepothole along river, Montana.
Pothole, formed by river erosion. Macdonald Creek, Glacier National Park, Montana. (090719-44)
Download ImageProterozoic stromatolites, Montana
Stromatolites in Proterozoic Helena Formation of the Belt Supergroup. Stromatalites are fossilized algal mats. (090718-114)
Download ImageSmall detached fold in sandstone and shale.
Small detached fold in sandstone and shale. Proterozoic Grinnell Formation, Glacier National Park, Montana. (090718-11)
Download ImageLewis thrust fault, Montana
The Lewis thrust fault, which places rock over the Proterozoic Belt Supergroup over Cretaceous rock, lies at the base of the cliffs, just below the tan rock unit. (090711-57)
Download ImageRepetition of strata on thrust, Montana.
Both ridge-forming rock units are Missiissippian-age limestone that has been repeated along a thrust fault. Sun River Canyon, Montana. (090716-43)
Download ImageTree roots and boulders.
Falling trees aid the downslope movement of bedrock in forested areas by pulling boulders up from beneath the land surface. (090710-54)
Download ImageHydrophytic plants in lake, southern Alberta.
Hydrophytic plants and reflection in lake, southern Alberta. (090710-13)
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