. Bulletin of the Geological Society of America. Geology. 348 E. B. BRANSON BULL LAKE CREEK ROCK SLIDE sissippian), 76 feet tliick, comes in above the Madison, forming a terrace, and finally the Tenslee]) (I\Minsyl\anian) adds a 400 to (500 foot cliff above the Amsden. Description of the Bull Lake Cueek Slide On the broad, steejdy slo])inc>' terrace extending from the base of the northern wall of the outer canyon to the rim of the inner gorge is a rock slide, or rock glacier, about 5 miles long and one-half to one mile wide. Starting at the west end of the north cliff the rock slide moves d
. Bulletin of the Geological Society of America. Geology. 348 E. B. BRANSON BULL LAKE CREEK ROCK SLIDE sissippian), 76 feet tliick, comes in above the Madison, forming a terrace, and finally the Tenslee]) (I\Minsyl\anian) adds a 400 to (500 foot cliff above the Amsden. Description of the Bull Lake Cueek Slide On the broad, steejdy slo])inc>' terrace extending from the base of the northern wall of the outer canyon to the rim of the inner gorge is a rock slide, or rock glacier, about 5 miles long and one-half to one mile wide. Starting at the west end of the north cliff the rock slide moves down a lO-degree slope along the cliff' base for 4 or 5 miles, then turns almost at right angles, crosses a terrace less than a mile in width, and enters the granite gorge. The slide is made up of rock fragments varying from mud particles to blocks of limestone 40 feet in diameter, and the large and small frag- ments are mixed together in endless variety. The largest blocks are of. P'lOi'UE 1.—Lo/'-rr End of Bull Lake Creek Photograph was taken neni- nunioral 1', plate 21, figure 1, hy Warner Bighorn dolomite, l)ut the greater part of the debris comes from the Shoshoni limestone. A series of longitudinal ridges traverses most of the slide and these are interrupted by many cross-ridges. Eidges made of fine material sometimes have one side 20 feet high, with a slope of 40 to 50 degrees. Cross-ridges covered with very large blocks of rock have separated, leaving deep valleys between, with black, shaly mud exposed at the bottom. On the sides there are ridges reseml)ling the lateral mo- raines of glaciers and at the upper end an amphitheater-like depression resembles a Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
