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144 C. D. Walcott — Cambrian System of North America. 



strata above and the highly-inclined (Huronian ?) strata beneath. 

 I have heretofore referred the pre-Tonto series to the Cambrian 

 and correlated it with the Keweenaw of Wisconsin and Llano 

 series of Texas, but I am now inclined to call all these series 



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pre-Cambrian and a system of equal degree with the Cambrian, 

 Lower Silurian (Ordovician), etc. If this is done the strata 

 below the Grand Canon series will be correlated with the Huro- 

 nian of the Wisconsin section. This will be referred to again. 



