. Bulletin of the Geological Society of America. Geology. PHYSICAL FEATURES OF THE REGION. 33 and infolds of Cretaceous rocks occur in this part of the mountains, while at least one isolated area of Paleozoic rocks is found to the east of the main margin of the range. Both the mountains and the adjacent foot- hills have been subjected to similar parallel folding and disturbance at the same post-Cretaceous orogenic period.*. Scale Miles. Figure i.—Southwestern Part of the District of Alberta. The foothill belt varies in width from 10 or 12 miles in its southern part to about 20 miles at the nor
. Bulletin of the Geological Society of America. Geology. PHYSICAL FEATURES OF THE REGION. 33 and infolds of Cretaceous rocks occur in this part of the mountains, while at least one isolated area of Paleozoic rocks is found to the east of the main margin of the range. Both the mountains and the adjacent foot- hills have been subjected to similar parallel folding and disturbance at the same post-Cretaceous orogenic period.*. Scale Miles. Figure i.—Southwestern Part of the District of Alberta. The foothill belt varies in width from 10 or 12 miles in its southern part to about 20 miles at the north, in the vicinity of Bow river. Funda- mentally, the foothills represent a bordering zone of folded and con- torted Cretaceous rocks, reduced by denudation to series of more or less nearly parallel ridges and valleys. The rivers and larger streams from the mountains generally cut across nearly at right angles in wide and relatively low transverse valleys, while the higher ridges and hills occa- sionally surpass 5,000 feet in elevation. * For some notes on this and on the Pliocene history of the region, see Am. Jour. Sei., June, 1895, p. 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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