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Tidal channels in estuary, Maine
Meandering tidal channels at low tide in estuary, Maine (180713-22)
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Meandering estuary, Maine (vertical)
Meandering estuary at low tide, Maine (180713-14)
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Zeolite minerals in volcanic rock (vertical)
Zeolite minerals filling vugs in mafic volcanic rock (180713-4)
Download ImageVegetation exploiting fractures in granite (vertical)
Vegetation exploiting fractures in granite, Maine (180712-67)
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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)
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