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pothole along river, Montana.
Pothole, formed by river erosion. Macdonald Creek, Glacier National Park, Montana. (090719-44)
Download ImageProterozoic stromatolites, Montana
Stromatolites in Proterozoic Helena Formation of the Belt Supergroup. Stromatalites are fossilized algal mats. (090718-114)
Download ImageSmall detached fold in sandstone and shale.
Small detached fold in sandstone and shale. Proterozoic Grinnell Formation, Glacier National Park, Montana. (090718-11)
Download ImageLewis thrust fault, Montana
The Lewis thrust fault, which places rock over the Proterozoic Belt Supergroup over Cretaceous rock, lies at the base of the cliffs, just below the tan rock unit. (090711-57)
Download ImageRepetition of strata on thrust, Montana.
Both ridge-forming rock units are Missiissippian-age limestone that has been repeated along a thrust fault. Sun River Canyon, Montana. (090716-43)
Download ImageTree roots and boulders.
Falling trees aid the downslope movement of bedrock in forested areas by pulling boulders up from beneath the land surface. (090710-54)
Download ImageHydrophytic plants in lake, southern Alberta.
Hydrophytic plants and reflection in lake, southern Alberta. (090710-13)
Download ImageLewis Thrust fault zone, Montana (Pan)
Normal faults extend the upper plate of Proterozoic rock of the Lewis Thrust, Glacier National Park, Montana. (090711-49)
Download ImageAncient mudcracks in rock.
Proterozoic mudcracks filled with sand in mudstone of the Proterozoic Belt Supergroup, southern Alberta, Canada. Photos is about 15 cm across. (090710-60).
Download ImageOverturned folds, Alberta.
Overturned syncline (above) and anticline (below) on mountainside, Waterton Lakes National Park, Alberta, Canada. (090710-8)
Download ImageU-shaped glacial valley and paternoster lakes
Carthew Lakes form a series of paternoster lakes in the upper reaches of a glacial valley in Waterton Lakes National Park, Alberta, Canada. (090710-25)
Download ImageLimestone cliffs, southern Alberta.
Paleozoic LImestone cliffs, southern Alberta, Canada. (090709-24)
Download ImageTalus Cones (vertical)
Talus cones, built through the accumulation of rock debris, fallen from the cliffs above. Banff National Park, Canada. (ID: 090707-14)
Download ImageBraided River and Canadian Rockies
The Kicking Horse River forms a braided river pattern as it flows through the Canadian Rockies in Yoho National Park, Canada. (090707-2)
Download ImageDrumlin, southern Alberta (Pan).
Drumlin, a depositional feature of continental ice sheets, southern Alberta, Canada. Ice flowed from left to right. (090709-19pan)
Download ImageDrumlin, southern Alberta.
Drumlin, a depositional feature of continental ice sheets, southern Alberta, Canada. Ice flowed from left to right. (090709-13)
Download ImageCleavage and bedding in limestone and shale.
Cleavage and bedding in gently folded limestone and shale, Yoho National Park, British Columbia, Canada. (090706-19)
Download ImageTalus Cones
Talus cones, built through the accumulation of rock debris, fallen from the cliffs above. Banff National Park, Canada. (ID: 090707-17)
Download ImageEocene Pillow Basalt, Washington (vertical)
Cliff exposure of Eocene pillow basalt of the accreted Siletzia Terrane (Crescent Formation). the pillow shapes result from the basalt being erupted underwater. Olympic National Park, WA. (090630-87)
Download ImageErosion of a natural bridge
Erosion of a natural bridge in limestone, Yoho National Park, British Columbia, Canada. (090706-49)
Download ImageAlkali lake, British Columbia, Canada.
Evaporating alkali lake in the Okanogan of. Note how it leaves behind zones of precipitated minerals. (090704-54)
Download Image
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