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SMITIISUMAN KXPLOKATIONS, 1C)22 



17 



15 and 16. The motor road is a fine public work and opens up for 

 pleasure and business direct connection through the main ranges of 

 the Rockies between the Bow and Columbia River valleys. 



The limestones and shales of both ranges are upturned and sheared 

 and faulted so as to make it very difficult, without detailed areal maps 

 and unlimited time, to work out the structure and the complete 

 stratigraphic succession of the various formations. (See fig. 17.) 



Fig. 18. — ^West slope of Stanford range south of Sinclair Pass, with white 

 quartzite band at base of Silurian limestones. About six miles (9.6 km.) 

 above Radium Hot Springs, British Columbia, Canada. (Mr. and Mrs. 

 C. D. Walcott, 1922.) 



The Silurian limestones, with their fossil coral beds above the white 

 quartzite of the Richmond transgression (see fig. 18) were found in 

 the upper portion of Sinclair Canyon, and not far away black shales 

 full of Silurian graptolites (fig. 19). Lower down the canyon thin 

 bedded gray limestones yielded fos.sils of the Mons ' formation not 

 unlike those so abundant at the head of Clearwater Canyon, 73 miles 

 ( 1 17.4 km.) to the north, and Glacier Lake, 94.6 miles ( 152.21 km.) 



' Smithsonian Misc. Coll., Vol. 72, No. i, p. 15, 1920. 



