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Pothole 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)
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. (190804-61)
Download ImageGranite domes in Texas Hill Country
Sloping edge of Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in S-central, Texas. (190804-59)
Download ImageGranite domes in Texas Hill Country
Sloping edge of Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in S-central, Texas. (190804-57)
Download ImageBlocks on sloping edge of granite dome, Texas
Sloping edge of Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in S-central, Texas. (190804-46)
Download ImageBlocks on sloping edge of granite dome, Texas
Sloping edge of Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in S-central, Texas. (190804-42)
Download ImageDry tinaja on granite, Texas
Dry tinaja on top of Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in S-central, Texas. (190804-35)
Download ImageGranite dome in Texas Hill Country
Sloping side of Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in S-central, Texas. (190804-14)
Download ImageEnchanted Rock, Texas, a granite dome
Hikers on Enchanted Rock, an isolated dome (monadnock) of Proterozoic (1.05 Ga) granite in south-central, Texas. (190804-14)
Download ImageLahar deposit, eastern Oregon
Lahar deposit of the Miocene Succor Creek Formation, Owyhee Canyon, Eastern Oregon (191208-74)
Download ImageColumns, Carlsbad Caverns NM (vertical)
Where a stalagmite merges with a stalactite it forms a column. Here, three columns have formed close together. (100131-73)
Download ImageSmall oxbow being stranded, Colorado
Small oxbow on floodplain being stranded as the main stream channel cuts it off, Colorado (2K5-3742)
Download ImageSea stacks and stormy weather, Oregon
Sea stacks and stormy weather, Bandon, Oregon coast. (200105-5)
Download ImageChromite vein in peridotite and fault
Chromite vein in peridotite and shear fracture (190504-29)
Download ImageSmall fault in peridotite
Small fault in peridotite offsetting chromite vein (black) and in the upper right, a quartz vein (white) (190504-28)
Download Image
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