STATE GEOLOGIST. 49 



and near the month of Chocolate md extend westward to 



join another belt beginning a few miles south of Huron river. 



The first bell in the neighborhood of the Machigamig river, 



inds tewards the Bouth, bo that on the State 



lary the Azoic belt stretches fr< m beyond Lac Vieux De- 



a a Island, in the Me: river. It extends 



thenc- ;d through Wisconsin and to the sources of the 



ssippi. The rocks of this system consist in Michigan of 



loritic and silicions slates, quartz, and beds of marble. 



-late, bec< mes, near Marquette, a novaculite, from 



which hones have been manufactured. In this system arc found 



I ecular and m Iron ores of Lake Superior, as well 



as of PilotJ£nob, and perha] a the Iron Mountain, in Missouri, 



tlie Adir- • v ;k, and other localities. This scries 



as thickness ( n the northern shores of 

 : and Huron; and Sir Win. Logan, the Director of 

 the Canadian Geological Survey, has decided that they consti- 

 tute two great systems, unconformable with each other, the 

 which he gty] Huronian series and the lower the 



Laurentian* The Bruce; Wellington, and neighboring mines, 

 are located in ks, and are worked for the ores of cop- 



per; while the Lake Superior min< s are l< rated in veins which 

 the age of the trap, and are w ; native copper. 



LV.— FOSSIUFEBQUS STRATA. 



I. — t R srara 



I. — Lak> v '<>ne. 



The reddish, yellowish, grayish or mottled sandstone, found 



along the south Bbore of Lake Superior lias, by different wri- 



d to differ* i •. 1 ut the 



idedly in favor of placing it at the 



d on the horizon of the 



fork. Further examinations will 



•Report loi2-3. i'. 8, lb;G p, 171. 



