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Geology 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)
Download ImagePothole eroded into limestone (vertical)
Pothole eroded into tilted Marble Falls Pennsylvanian limestone on the Pedernales River, Texas -formed by scouring of the bedrock during floods. (190804-106)
Download ImagePotholes eroded into limestone, Texas
Potholes eroded into tilted Marble Falls Pennsylvanian limestone on the Pedernales River, Texas -formed by scouring of the bedrock during floods. (190804-94)
Download ImageStrike of tilted Pennsylvanian limestone, TX
Tilted Pennsylvanian Marble Falls limestone and the Pedernales River, Texas. Intersection of the water and the beds defines strike. (190804-90)
Download ImagePedestal of weathering granite, Texas
Pedestal of weathering granite on the sloping edge of Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in S-central, Texas. Note the exfoliation blocks on the side of the dome. (190804-80)
Download ImageDetached block of exfoliating granite, Texas
Exfoliation blocks on the sloping edge of Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in S-central, Texas. (190804-75)
Download ImageExfoliation of granite dome near Austin, TX
Exfoliation blocks on the sloping edge of Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in S-central, Texas. (190804-71)
Download ImageExfoliation of granite dome near Austin, TX
Exfoliation blocks on the sloping edge of Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in S-central, Texas. (190804-69)
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