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Granite coastline, Acadia NP, Maine
Coastline formed on Cadillac Granite, Acadia National Park, Maine. Note how the landscape is shaped by the sheeting fractures (unloading joints) in the granite. (180712-20)
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Proterozoic stromatolites, Montana
Stromatolites in Proterozoic Helena Formation, Glacier National Park, Montana (100710-42)
Download ImagePlumose fracture in argillite.
Plumose fracture in argillite of Proterozoic Appekunny Formation, NW Montana –penny for scale. (100710-39)
Download ImagePlumose fracture in argillite.
Plumose fracture in argillite of Proterozoic Appekunny Formation, NW Montana –about 40 cm across. (100710-38)
Download ImageAsymmetric fold and thrust faults, Montana
Asymmetric anticline and thrust faults involving Cretaceous Blackleaf Formation, NW Montana (100710-2)
Download ImageMatrix-supported conglomerate
Matrix-supported conglomerate, Cretaceous Kootenai Formation, Montana (130727-68)
Download ImageConglomerate
Conglomerate of the Cretaceous Kootenai Formation, Montana. Photo is about 0.5m across. (130727-66)
Download ImageColumnar jointing in basalt, Montana
Colonnade in 50 Ma basalt flow, SW Montana (130725-8)
Download ImageColumnar jointing in basalt, Montana
Colonnade in 50 Ma basalt flow, SW Montana (130725-5)
Download ImageBasalt columns, SW Montana (vertical)
Colonnade in 50 Ma basalt flow, SW Montana (130725-3)
Download ImageCobbles along lakeshore, Montana
Cobbles along shoreline of glacial Lake McDonald, Glacier National Park, Montana (130724-12)
Download ImageDiorite, weathered and fresh surfaces
Close-up view of diorite showing both weathered (top) and fresh surfaces. Penny for scale. Purcell sill, Glacier National Park, Montana. (130723-65)
Download ImageProterozoic mudcracks, Montana
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. (130723-55)
Download ImageProterozoic mudcracks, Montana
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. Photo about .75m across. (130723-53)
Download ImageProterozoic mudcracks, Montana (vertical)
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. Photo about .20cm across. (130723-52)
Download ImageProterozoic mudcracks, Montana
Mudcracks in Proterozoic Snowslip Fm. of Belt Supergroup, Glacier National Park, Montana. (130723-35)
Download ImagePurcell Sill, Montana (vertical)
Diorite sill (Purcell sill), intruding sedimentary rock of Proterozoic Belt Supergroup. Note the zone of bleaching along the sill caused by contact metamorphism. (130723-7)
Download ImageThrust fault, SW Montana
Thrust fault cutting dipping limestone of the Cretaceous Kootenai Formation, SW Montana. (130716-7)
Download ImageFolded limestone and thrust fault
Folded limestone and thrust fault, SW Montana (130716-5)
Download ImageFolds and thrust fault, Montana (Pan)
Folded limestone and thrust fault, SW Montana (130716-5)
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