﻿C. D. Walcott — Cambrian System of Worth America. 141 



The first section (fig. 2) to which I wish to direct your atten- 

 tion is that of the Wasatch Mountains, in Utah, where the 

 Cambrian is well shown in Big Cottonwood Canon. The 

 section is described in the reports of the Geologists of the 



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Fortieth Parallel Survey (Geol. Expl. 40th Par., vol. i, p. 229 ; 

 vol. ii, p. 366), but I had the opportunity of examining it more 

 in detail during the summer of 1885, and through finding the 



