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Turtle Cove Member of John Day Fm, Oregon
Turtle Cove Member of the Oligocene John Day Formation as exposed in the Blue Basin part of the Sheep Rock Unit of John Day Fossil Beds National Monument (110806-33)
Download ImagePermian Reef Complex, Texas (Pan)
El Capitan, massive Permian limestone, forms the central part of the Permian Reef Complex that makes up the Guadalupe Mountains of west Texas. Below the peak are shale deposits from deeper parts of the basin. Guadalupe Mountains National Park (100131-10)
Download ImageCinder cones of Potrillo Volc field, New Mexico
Aerial view of cinder cones of Potrillo Volcanic Field in southern New Mexico. (100202-17)
Download ImageCross-Bedding in gypsum sand dunes, White Sands NM
Cross-Bedding surfaces in gypsum sand dunes, White Sands National Monument, New Mexico.
Download ImageCross-Bedding in gypsum sand dunes, White Sands NM
Cross-Bedding surfaces in gypsum sand dunes, White Sands National Monument, New Mexico. (100201-122)
Download ImageGypsum pedestal, White Sands, New Mexico.
Large gypsum pedestal and salt-tolerant mesquite shrubs, The pedestal is an erosional remnant: it consists of more consolidated sand that is more resistant to erosion than the surrounding poorly consolidated sand. White Sands National Monument, New Mexico. (100201-118)
Download ImageWind ripples and dunes, White Sands, New Mexico.
Wind ripples and dunes, White Sands National Monument, New Mexico. Note the asymmetry of the dunes, to indicate a prevailing wind from the left (west).(100201-93)
Download ImageSmall yardangs, White Sands National Monument, New Mexico
Small yardangs, formed by wind abrasion of older, more cohesive sediment. White Sands National Monument, New Mexico (100201-76)
Download ImageSlip face in dune, White Sands, New Mexico.
Slip face in white, gypsum dune, White Sands National Monument, New Mexico. (100201-50)
Download ImageCastner Marble, Franklin Mountains, Texas (vertical)
Proterozoic Castner Marble with garnet porphyroblasts, Franklin Mountains, Texas. (100201-39)
Download ImageProterozoic Castner Marble with garnets, Texas
Proterozoic Castner Marble with garnet porphyroblasts, Franklin Mountains, Texas. (100201-38))
Download ImageCastner Marble with garnet porphyroblasts, Texas.
Proterozoic Castner Marble and garnet porphyroblasts, which grew because of contact metamorphism. Franklin Mountains, Texas (100201-37)
Download ImagePermian Reef, Guadalupe Mtns National Park, Texas.
Permian Reef Complex and Chihuahuan Desert, Guadalupe Mountains Naitonal Park, Texas. The peak, as well as rocks to its left are massive limestone that made up the reef itself; the rock that lies to the right of the peak consists of inclined limestone strata and brecciated rock that made up the fore reef. Fine-grained rock (shale) of the basin lies at the base of the slope. (100131-144)
Download ImagePermian Reef, Guadalupe Mtns National Park, Texas.
Reefal limestone and near back-reef limestone of the Permian Reef complex, Texas. The steep slope on the right is underlain by limestone and breccia of the forereef.. Guadalupe Mountains National Park, Texas (100131-137)
Download ImageCastner Marble, El Paso, TX
Calc-silicate marble. Proterozoic Castner Marble, Franklin Mountains, Texas (100129-40)
Download ImageFelsic sills intruding metasedimentary rock,Texas.
Felsic sills intruding Proterozoic Castner Marble, Franklin Mountains, Texas (100129-32)
Download ImageCross-cutting dikes intruding metasedimentary rock, Texas.
Felsic dikes intruding metasedimentary rock, Franklin Mountains, Texas (100129-24)
Download ImageTilted Ordovician sedimentary rock, El Paso, Texas
Aerial view of tilted Ordovician sedimentary rock of the Franklin Mountains and El Paso, Texas (100128-114)
Download ImageMt. Baker stratovolcano, Washington (vertical)
Mt. Baker, a glacier-covered stratovolcano in northern Washington (220830-7)
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Rotated quartzite blocks
Rotated quartzite blocks in marble shear zone. Interpreted shear direction is top-right. Death Valley, California. (230328-6)
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