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Mudcracks and alkali deposits (vertical)
Mudcracks and alkali deposits, Death Valley National Park, California (190328-53)
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Desert Varnish on rock with fresh surface
Desert Varnish on rock with fresh surface exposed (190328-44)
Download ImageTilted rocks in Death Valley, CA
Tilted sedimentary rocks (and younger horizontal ones near center) in Death Valley National Park, California (190328-36)
Download ImageFeeder dike and rhyolite flow (vertical)
Feeder dike and rhyolite flow in the Black Mountains of Death Valley National Park, California (190328-29)
Download ImageFeeder dike and rhyolite flow
Feeder dike and rhyolite flow in the Black Mountains of Death Valley National Park, California (190328-26)
Download ImageSheath fold in neck of pegmatite boudins
Sheath fold in neck of pegmatite boudins within ductiley deformed marble. close-up of 4511-40. Rock hammer for scale. (4511-40c)
Download ImagePegmatite boudins in deformed marble
Pegmatite boudins in ductiley deformed marble. Note the sheath fold just below the boudin necks. Rock hammer for scale in center lower-left. (4511-40)
Download ImageCross-bedding in sand dunes, Oregon
Cross-bedding in sand dunes, Oregon (Umpqua Coastal Dunes) (190323-70)
Download ImagePond in coastal sand dunes, Oregon
Small pond within the Coastal sand dunes of Oregon (Umpqua Dunes) –an exposure of the water table! (190323-62)
Download ImageEdge of Coastal Dunes and beach, Oregon
Edge of Coastal Dunes and beach, Oregon –note the cross-bedding at the base of the dunes. (190323-49)
Download ImagePond in coastal sand dunes, Oregon
Small pond within the Coastal sand dunes of Oregon (Umpqua Dunes) –an exposure of the water table! (190323-47)
Download ImageSmall creek in coastal dune field, Oregon
Small creek in deflation plain of coastal dune field (Umpqua Dunes), Oregon (190323-39)
Download ImageDesert varnish on sandstone cliffs, Nevada
Desert varnish on cliffs of Aztec Sandstone, Nevada (171217-11)
Download ImageEl Capitan, Guadalupe Mountains NP, Texas.
El Capitan, Guadalupe Mountains National Park, Texas. The main cliff consists of massive Permian limestone. It formed the central part of the Permian Reef Complex that makes up the Guadalupe Mtns. Below the peak are shale deposits from deeper parts of the basin. (100191-12)
Download ImageEl Capitan, Guadalupe Mtns NP, Texas (pan)
El Capitan, Guadalupe Mountains National Park, Texas. The main cliff consists of massive Permian limestone. It formed the central part of the Permian Reef Complex that makes up the Guadalupe Mtns. Below the peak are shale deposits from deeper parts of the basin. (100191-12C)
Download ImageEl Capitan, Guadalupe Mtns NP, Texas (Vertical)
El Capitan, Guadalupe Mountains National Park, Texas. The main cliff consists of massive Permian limestone. It formed the central part of the Permian Reef Complex that makes up the Guadalupe Mtns. Below the peak are shale deposits from deeper parts of the basin. (100191-12B)
Download ImageGlacial cirque, Glacier NP, Montana
Iceberg Lake fills a glacial cirque in Glacier National Park, Montana. Cliffs of Proterozoic Belt Supergroup (sedimentary) define the back of the cirque. (160715-39)
Download ImageGlacial cirque, Glacier NP, Montana
Iceberg Lake fills a glacial cirque in Glacier National Park, Montana. Cliffs of Proterozoic Belt Supergroup (sedimentary) define the back of the cirque. (160715-35)
Download ImageDiorite of the Purcell Sill, Glacier NP, Montana
Diorite of the Proterozoic Purcell Sill, Glacier National Park, Montana. Note the elongate black hornblende crystals and the light green epidote in the upper right quarter of the photo. Handlens for scale. (150713-99)
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