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Conglomerate of Chilliwack terrane, WA (vertical)
Paleozoic conglomerate of Chilliwack accreted terrane in the North Cascades of Washington. Glaciated Mt. Shuksan forms the background. (210824-10) glaciers
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Duplex thrust faults, SW Montana
Floor and roof thrusts in limestone plus multiple “horses” of imbricated thrust faults form a duplex in Cretaceous limestone of SW Montana (210801-12)
Download ImageMeandering river and floodplain, Montana
Meandering Bighole River and its floodplain in SW Montana. Gravel-covered point bar forms the middle ground of the photo. (210801-7)
Download ImageGlacially striated bedrock and ice, MT
Glacially striated bedrock in cirque of Grinnell Glacier. Glacier National Park, Montana (210724-78)
Download ImageLake-filled glacial cirque, Montana
Iceberg laden Upper Grinnell Lake occupies much of the Grinnell Glacier cirque in Glacier National Park, Montana (210724-77)
Download ImageLake-filled glacial cirque, Montana
Iceberg laden Upper Grinnell Lake occupies much of the Grinnell Glacier cirque in Glacier National Park, Montana (210724-72)
Download ImageStream and ledges of Helena Dolomite, MT
Outflow stream and ledges of Proterozoic Helena Dolomite, Glacier National Park, Montana (210724-69)
Download ImagepC stromatolites and striations (vertical)
Proterozoic Conophyton stromatolites as they appear on a bedding surface, overprinted by glacial striations. Helena Dolomite, Belt Supergroup, Glacier National Park, Montana. Hiking poles for scale (210724-65)
Download ImageProterozoic stromatolites and striations
Proterozoic Conophyton stromatolites as they appear on a bedding surface, overprinted by glacial striations. Helena Dolomite, Belt Supergroup, Glacier National Park, Montana. Hiking poles for scale (210724-64)
Download ImageProterozoic stromatolites and striations
Proterozoic Conophyton stromatolites as they appear on a bedding surface, overprinted by glacial striations. Helena Dolomite, Belt Supergroup, Glacier National Park, Montana. (210724-65)
Download ImageGlacial striations and cirque, MT (vertical)
Glacial striations and cirque of Grinnell Glacier, Glacier National National Park, Montana. Note the dark-colored Purcell Sill and the waterfall on the headwall. (210724-57)
Download ImageGlacial striations and cirque, Montana
Glacial striations and cirque of Grinnell Glacier, Glacier National National Park, Montana. Note the dark-colored Purcell Sill and the waterfall on the headwall. (210724-55)
Download ImageMudcracks in sedimentary rock
Filled Mudcracks in Proterozoic Grinnell Formation –a part of the Belt Supergroup of Glacier National Park, Montana. (210724-51) red rock
Download ImageProterozoic stromatolites
Cross-sectional view of Conophyton stromatolites in Proterozoic Helena Dolomite of the Belt Supergroup of Glacier National Park, Montana Hiking poles for scale .(210724-48)
Download ImageProterozoic stromatolites
Conophyton stromatolites as they appear on a bedding surface. Note the overprinting glacial striations. Helena Dolomite, Belt Supergroup, Glacier National Park, Montana (210724-41)
Download ImageProterozoic stromatolites
Conophyton stromatolites as they appear on a bedding surface. Note the overprinting glacial striations. Helena Dolomite, Belt Supergroup, Glacier National Park, Montana. Pocket knife for scale (210724-40)
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Conophyton stromatolites as they appear on a bedding surface. Helena Dolomite, Belt Supergroup, Glacier National Park, Montana. Pocket knife for scale (210724-39)
Download ImageCrevasses in glacier, Montana
Crevasses in Grinnell Glacier, and Upper Grinnell Lake, Glacier National Park, Montana
Download ImageProterozoic Grinnell Formation, MT (vetical)
Outcrop of Proterozoic Grinnell Formation, Glacier National Park, Montana. Purcell Sill forms the dark band in the glacial headwall in the background. (210724-17)
Download ImageProterozoic Grinnell Formation, Montana
Outcrop of Proterozoic Grinnell Formation, Glacier National Park, Montana. Purcell Sill forms the dark band in the glacial headwall in the background. (210724-16)
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