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Swash zone and coastal dunes, Oregon
HIker and dogs on lonely Oregon beach, showing the swash zone, beach, and coastal dunes, (210320-24)
Download ImageImbricate thrust faults, Montana
Imbricate thrust faults: duplication of light-brown shale of the Triassic Lower Dinwoody Formation over the darker-brown ledges of the Upper Dinwoody, SW Montana (130727-62)
Download ImageOverturned folds in limestone, Montana (Pan)
Panorama of overturned folds in Triassic limestone of the Dinwoody Formation, SW Montana (190713-23)
Download ImageStromatolites in dolomite, Montana
Proterozoic stromatolites exposed on bedding surface of Helena Dolomite, Glacier National Park, Montana. Note the glacial striations. (150713-95)
Download ImageCirque and tarn, Glacier NP, Montana
Upper Grinnell Lake perched on tilted ledges of Proterozoic Helena Dolomite in Glacier National Park, Montana. (150713-82)
Download ImageStromatolites in dolomite, MT (Vertical)
Proterozoic stromatolites exposed on bedding surface of Helena Dolomite in cirque of Grinnell Glacier, Glacier National Park, Montana. Note the Purcell sill in the glacial headwall in the background. (150713-52)
Download ImageIcebergs on glacial lake, Glacier NP, Montana
Icebergs on Upper Grinnell Lake, a tarn in the cirque of Grinnell Glacier, Glacier National Park, Montana. Salamander Glacier forms the elongate snowfield above the lake. The bedrock in the foreground and behind the waterfall consists of Proterozoic Helena Dolomite. (150713-50)
Download ImageGeology students in the field, Montana
Geology students in the field, SW Montana (150710-31)
Download ImageDipping Mesozoic strata, SW Montana
Dipping beds of Triassic (foreground) through Cretaceous sedimentary rock in SW Montana. (120726-37)
Download ImageRiver transport of aggregate, Minnesota
Transporting aggregate by barge on the Mississippi River –Minneapolis, Minnesota (131023-8) fall colors
Download ImageOrdovician limestone, Minnesota, Minnesota (Vertical)
Outcrop of Ordovician Platteville Formation along the Mississippi River, Minneapolis, Minnesota. (131023-3)
Download ImageOrdovician limestone, Minnesota
Outcrop of Ordovician Platteville Formation along the Mississippi River, Minneapolis, Minnesota. (131023-1)
Download ImageThrust faults and anticline, B.C., Canada.
Thrust faults and ramp anticline in sedimentary rock, British Columbia, Canada. (120705-12)
Download ImageThrust fault and anticline, BC, Canada.
Thrust fault and ramp anticline in sedimentary rock, British Columbia, Canada. Hammer in lower-center of photo. (120707-10)
Download ImageSea cliff retreat, California (vertical)
Aerial view of sea cliff retreat along Cal State highway 1, California (9AD2K4-025)
Download ImageWater towers, Bastrop, TX (vertical)
Elevated water towers near Bastrop, Texas (190805-3)
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Pennsylvanian crinoid stem, TX
Cross-section of crinoid stem in Pennsylvanian Marble Falls Limestone, Pedernales Falls State Park, south-central Texas. (190804-109)
Download ImagePennsylvanian crinoid stem, TX (Pan)
Cross-section of crinoid stem in Pennsylvanian Marble Falls Limestone, Pedernales Falls State Park, south-central Texas. (190804-107)
Download ImagePothole eroded into limestone (vertical)
Pothole eroded into Pennsylvanian limestone on the Pedernales River, Texas -formed by scouring of the bedrock during floods. (190804-106)
Download ImagePothole eroded into limestone, Texas
Pothole eroded into Pennsylvanian limestone on the Pedernales River, Texas -formed by scouring of the bedrock during floods. (190804-101)
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