Age of the Quartziies, Schists, Etc., of SauTc Co. 137 



sented in tlie present paper are only those necessary to sliow 

 the age of the rocks. 



There are several more of these scattered qnartzite ranges in 

 Wisconsin, all but one of them occurring within the Potsdam 

 and Calciferous areas. During the coming season I hope to be 

 able to make a connected study of them. 

 University op Wisconsin, November 18, 1871. 



