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fluvial cross-bedding in sandstone.
Small-scale cross-bedding in sandstone. Photo is about 75 cm across. (110528-61)
Download ImagePaleosols of John Day Formation, OR
Eroded ash beds and ancient soils (paleosols) of the Oligocene John Day Formation, Oregon. John Day Fossil Beds National Monument. (110531-73)
Download ImageWhite asbestos: chrysotile. (vertical)
White asbestos, (chrysotile, a magnesium silicate).
Download ImageAngle of repose (vertical)
Angle of repose: gravel and sand being deposited atop a cone of aggregate from a conveyor belt. (110531-91)
Download ImageAngle of repose
Angle of repose: gravel and sand being deposited atop a cone of aggregate from a conveyor belt. (110531-90)
Download ImageRapakivi granite close-up
Rapakivi granite: a granite with feldspars of orthoclase cores and oligoclase (plagioclase) rims. Note the zoning in the feldsars. Penny for scale. (110530-25)
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Rapakivi granite close-up
Rapakivi granite: a granite with feldspars of orthoclase cores and oligoclase (plagioclase) rims. Note the zoning in the feldsars. (110530-24)
Download ImagePaleosol (ancient soil) between two basaltic lava flows, eastern
Paleosol (ancient soil) between two basaltic lava flows, eastern Oregon.
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Rapakivi granite close-up
Rapakivi granite: a granite with feldspars of orthoclase cores and oligoclase (plagioclase) rims. Note the zoning in the feldsars. Penny for scale. (110530-23)
Download ImageSmall-scale cross-bedding in sandstone.
Small-scale cross-bedding in sandstone. (110528-57)
Download ImageIron-rich concretion in sandstone.
Iron-rich concretion in cross-bedded sandstone. (110528-60)
Download ImageWind ripples and sand, SE California.
Wind ripples and sand, SE California. (110502-6)
Download ImageMudcracks and sand dunes.
Mudcracked lakebed deposit exposed in interdune area of dune field, Death Valley National Park, California (110502-84).
Download ImageMudcracks and sand dunes (vertical).
Mudcracked lakebed deposit exposed in interdune area of dune field, Death Valley National Park, California (110502-91).
Download ImageCreosote bush on sand dune (vertical)
Creosote bush on sand dune, SE California.(Larrea tridentata) Death Valley National Park, California.
Download ImageDune environment, SE California.
Dune environment and desert mountains, Death Valley National Park, California. Vegetation consists of creosote bush (Larrea tridentata) and mesquite (Nahuatl mizquitl).
Download ImageSand flows down slip face of sand dune.
Sand flows down slip face of sand dune. Most recent flow lies near the left-center of photo; older flows are to the left and right. (110502-53)
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