PHYSIOGRAPHY 



131 



the mountains proper and the great detached blocks of granite which 

 cover their surface give as a result the appearance of a deeply buried 

 range with the tops just protruding through the plain. In a way this is 

 a true conception of the case. 



The northernmost series of hills consists mainly of limestone, but in- 

 cludes some porphyry, granite, and gabbro. In the vicinity of Rainy 

 mountain they are made up of a series of detached and rounded lime- 

 stone hills rising out of the prairie 70 to 400 feet and with a general dip 

 north. East of this region, and extending from north of Saddle moun- 

 tain to a little northeast of mount Scott, the hills are traversed b}^ no pass 





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„Mi'ifiiif/finiwi/fi/iiii 



, m ,rr/*m'!*M«*M' i 'i"' , » m ''* 



^''Zm 



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Figure 2. — Sketch of Lower JSarrows. 

 Showing sharp granite hills with flat plains between. 



and consist of a complicated, much folded and faulted mass of limestone, 

 with porphyr}', granite, and a little grabbro. This series of hills stretches 

 north, with a triangular outline culminating about 10 miles southeast of 

 Mountain view. The pass north from mount Scott is traversed by the 

 Fort Sill-Cheyenne trail, which follows the narrow canyon of Blue creek, 

 separating the range just described from another limestone range. The 

 latter shows a complicated structure near the pass, becoming simpler to 

 the northeast, where the limestone crops out on Lime and Chandler 

 creeks. To the north the hills swing round, crescent-like, to meet the 

 point of the limestone triangle already noted. 



South of the series of limestone hills, and separating them from the 

 first of the granite ranges, is the broad open valley occupied in part by 



