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Purcell Sill, Glacier National Park, Montana
Purcell Sill, a diorite intrusion into the Proterozoic Belt Supergroup of Glacier National Park, Montana (100712-24)
Download ImageDiorite of the Purcell Sill, Glacier NP, Montana
Diorite of the Proterozoic Purcell Sill, Glacier National Park, Montana. Note the elongate black hornblende crystals and the light green epidote in the upper right quarter of the photo. Handlens for scale. (150713-99)
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 ImagePurcell sill, Glacier National Park, Montana.
The dark band in this cliff face is the Purcell Sill, and diorite sill that intrudes rock of the Proterozoic Belt Supergroup in Glacier National Park. The white rock on either side of the sill is bleached because of the contact metamorphism. (Image ID# lg-25)
Download ImageDiorite sill (Purcell sill), Montana
Diorite sill (Purcell sill) intruding Precambrian Belt Supergroup. Note bleached zone on either side of sill that formed by contact metamorphism. Glacier National Park, Montana. (Ig-24)
Download ImageGlacial striations and cirque, MT (vertical)
Glacial striations and cirque of Grinnell Glacier, Glacier National National Park, Montana. Note the dark-colored Purcell Sill and the waterfall on the headwall. (210724-57)
Download ImageGlacial striations and cirque, Montana
Glacial striations and cirque of Grinnell Glacier, Glacier National National Park, Montana. Note the dark-colored Purcell Sill and the waterfall on the headwall. (210724-55)
Download ImageProterozoic 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)
Download ImageProterozoic 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)
Download ImageMt. Gould at sunrise, Glacier NP, Montana
Mt. Gould and Lake Josephine at sunrise, Glacier National Park, Montana. Note the Purcell Sill. (210724-6)
Download ImageStromatolites in dolomite, MT (Vertical)
Proterozoic stromatolites exposed on bedding surface of Helena Dolomite in cirque of Grinnell Glacier, Glacier National Park, Montana. Note the Purcell sill in the glacial headwall in the background. (150713-52)
Download ImageIntrusive sill and contact metamorphism (vertical)
Diorite sill and bleached reaction zone of contact metamorphism in the adjacent country rock-Purcell Sill intruding Proterozoic Helena Fm, Glacier National Park, Montana. Sill is about 2 meters thick. (4GlD-016)
Download ImageIntrusive sill and contact metamorphism
Diorite sill and bleached reaction zone of contact metamorphism in the adjacent country rock-Purcell Sill intruding Proterozoic Helena Fm, Glacier National Park, Montana. Sill is about 2 meters thick. (4GlD-015)
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 ImageMetamorphosed pillow basalt (vertical)
Metamorphosed pillow basalt (Purcell Lavas–greenstone), Glacier National Park, Montana. (Ig-105)
Download ImageGlacial headwall and igneous sill, Montana
Headwall of Proterozoic Belt Supergroup intruded by Purcell sill (diorite) behind the Grinnell Glacier in Glacier National Park, Montana. 4Gl-A)
Download Image
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