Search for any geological feature below
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Hogback ridges, Colorado
Aerial view of hogback ridges along edge of Colorado’s Front Range near Boulder, Colorado. Great Unconformity, between Pennsylvanian Fountain Formation and Precambrian basement appears at base of Flatiron in lower part of photo. (IP17-2789)
Download ImageLakes show groundwater table, Colorado
Aerial view of lakes showing groundwater table near Denver, Colorado (IP172786)
Download ImageMississippi River Delta, Louisiana
Aerial view of mouth of Mississippi River Delta, Louisiana (IP17-2750)
Download ImageMississippi River Delta, Louisiana
Aerial view of mouth of Mississippi River Delta, Louisiana (IP17-2749)
Download ImageCross-bedded sandstone (vertical)
Cross-bedded, coarse-grained sandstone, right-side up. (IP17-2535)
Download ImageSheath fold in gneiss (vertical)
Sheath fold in gneiss, about .5 m across (IP17-2533)
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Tilted Columbia River Basalt, Washington (Pan)
Angular unconformity between tilted Miocene Grande Ronde Basalt and flat-lying Quaternary Underwood Basalt (high on left), Washington. (IP16-1662)
Download ImageHogback fins, Colorado
Erosional remnants of vertically dipping sandstone of the Permian Lyons Formation in Garden of the Gods, Colorado. The erosion produced narrow hogback fins. (IP16-1593)
Download ImageCross-bedded arkosic sandstone (vertical)
Cross-bedded, coarse-grained arkosic sandstone of the Pennsylvanian Fountain Formation, Colorado. Rocks get younger towards the left. Photo is about 1 meter across. (IP16-1582)
Download ImageCross-bedded arkosic sandstone
Cross-bedded, coarse-grained arkosic sandstone of the Pennsylvanian Fountain Formation, Colorado (IP16-1581)
Download ImageEffects of soil creep, Oregon (vertical)
tilted retaining wall from soil creep, Oregon (IP17-4154)
Download ImageSlackwater deposits, Washington
Slackwater sediments, deposited in temporary lakes formed during the Ice Age (Missoula) floods, Washington. (IP16-3816)
Download ImageGrinnell Fm and Clark Fork, Montana
Proterozoic Grinnell Formation (sandstone) of the Belt Supergroup cropping out in the Clark Fork, the main river that drains NW Montana. (IP16-3580)
Download ImageGrinnell Fm and Clark Fork, Montana (vertical)
Proterozoic Grinnell Formation (sandstone) of the Belt Supergroup cropping out in the Clark Fork, the main river that drains NW Montana. (IP16-3580)
Download ImageGrinnell Fm and Clark Fork, Montana
Proterozoic Grinnell Formation (sandstone) of the Belt Supergroup cropping out in the Clark Fork, the main river that drains NW Montana. (IP16-3580)
Download ImageSteeply dipping sandstone, Olympic Coast, Washington (IP16-3491)
Steeply dipping Eocene sandstone, Olympic coast, Washington IP16-3491)
Download ImageDry Falls Cataract, Washington (Pan)
Dry Falls Cataract, Washington, formed by catastrophic erosion of Columbia River Basalt Group lava flows in lower Grand Coulee by the Ice Age (Missoula) Floods. (IP16-3808)
Download ImageEocene Ginkgo leaf (square)
fossilized Eocene Ginkgo leaf, Republic, Washington (IP16-3782)
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