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5332 images found

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Proterozoic 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)

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Proterozoic 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)

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Proterozoic 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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Proterozoic stromatolites

Conophyton stromatolites as they appear on a bedding surface. Helena Dolomite, Belt Supergroup, Glacier National Park, Montana. Pocket knife for scale (210724-39)

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Crevasses in glacier, Montana

Crevasses in Grinnell Glacier, and Upper Grinnell Lake, Glacier National Park, Montana

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Proterozoic 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)

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Proterozoic 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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Cross-bedded Grinnell Fm., Montana

Cross-bedding in sandstone of Proterozoic Grinnell Formation of the Belt Supergroup in Glacier National Park, Montana (210724-14)

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Cross-bedded Grinnell Fm., Montana

Cross-bedding in sandstone of Proterozoic Grinnell Formation of the Belt Supergroup in Glacier National Park, Montana . Note that it dips in two different directions. (210724-14)

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Rip-up clasts in Grinnell Fm., Montana

Rip-cup clasts in sandstone of Proterozoic Grinnell Formation of the Belt Supergroup in Glacier National Park, Montana . (210724-14) Precambrian

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Mt. Gould at sunrise, Glacier NP, Montana

Mt. Gould and Lake Josephine at sunrise, Glacier National Park, Montana. Note the Purcell Sill. (210724-6)

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Running Eagle Falls and Lewis Thrust, MT

Running Eagle falls pours from slot in Proterozoic Altyn Dolomite. Foreground rocks are Cretaceous sandstone; Lewis thrust emplaced the Proterozoic rock over the Cretaceous. (210723-22)

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