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Cross-bedded Cretaceous sandstone, Montana
Cross-bedding in Cretaceous Kootenai Formation, Montana. (170802-13).
Download ImageArchean garnet schist, Montana
Almandine garnets in quartz muscovite schist, Montana (170802-10)
Download ImageConglomerate, Montana (vertical)
Basal conglomerate of the Cretaceous Kootenai Formation, SW Montana. (170802-8)
Download ImageConglomerate, Montana
Basal conglomerate of the Cretaceous Kootenai Formation, SW Montana. Cobbles are mosty chert and quartzite. (170802-4)
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“S” fold in limestone, SW Montana.
Folded limestone of Cretaceous Kootenai Formation, SW Montana. (170730-8).
Download ImageBedded chert, SW Montana
Chert of Permian Phosphoria Formation, SW Montana (170728-21).
Download ImageBedded chert, SW Montana
Chert of Permian Phosphoria Formation, SW Montana (170728-20).
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Cliffs of Precambrian Snowslip Fm., Glacier NP, Montana
Snowslip Formation forms cliffs near Logan Pass, Glacier National Park, Montana. The Snowslip is part of the Proterozoic Belt Supergroup (170724-31)
Download ImageCliffs of Precambrian Snowslip Fm., Glacier NP, Montana
Snowslip Formation forms cliffs near Logan Pass, Glacier National Park, Montana. The Snowslip is part of the Proterozoic Belt Supergroup (170724-29)
Download ImageGlacial Arete, Montana
The Garden Wall, a glacial arete in Glacier National Park, Montana. Rock is part of the sedimentary Proterozoic Belt Supergroup. (170724-25)
Download ImageCliffs of Precambrian Snowslip Fm., Glacier NP, Montana
Snowslip Formation forms cliffs near Logan Pass, Glacier National Park, Montana. The Snowslip is part of the Proterozoic Belt Supergroup (170724-23)
Download ImageProterozoic stromatolites, Montana
Stromatolites (fossilized algal mats) of the Snowslip Formation, part of the Proterozoic Belt Supergroup in Glacier Natoinal Park, Montana (170724-18).
Download ImageGlacial lake, Montana
pebbles along the shoreline of glacial Two Medicine Lake, Glacier National Park, Montana. (179724-12)
Download ImageLewis Thrust fault, N. Montana (vertical)
The Lewis Thrust places Proterozoic Belt Supergroup over Cretaceous sedimentary rock. It appears at the base of the light-colored ledge (Altyn Dolomite) in the middle of this photo. It’s the dominant structure of Glacier National Park. (170724-10)
Download ImageLewis Thrust fault, N. Montana
The Lewis Thrust places Proterozoic Belt Supergroup over Cretaceous sedimentary rock. It appears at the base of the light-colored ledge (Altyn Dolomite) in the middle of this photo. It’s the dominant structure of Glacier National Park. (170724-8)
Download Imagesalt casts in mudstone
salt casts preserved in Proterozoic Grinnell Formation of the Belt Supergroup, northern Montana. (170802-22)
Download ImageIntrusive Columbia River Basalt. OR.
Cliffs of intrusive Columbia River Basalt Group are part of a giant sill at Neahkahnie Mountain, Oregon. Coast Range in the background. (170826-72)
Download ImageHaystack Rock, Cannon Beach, OR
Seastacks and incoming surf at Cannon Beach, Oregon. Haystack Rock on the right, is an eroded seafloor volcanic vent of intrusive Columbia River Basalt. (170826-44)
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