STATE GEOLOGIST. 51 



■tone containing fossils in a perfect state of preservation, A 

 oonglomerate also occurs here, made up of rounded masi 

 quart/., ranging from the size of a pea to boulders many ton* 

 in weight, all cemented together by a silioious Limestone, not 

 altered, but appearing as if deposited amongst the interstices 



ami upcn spaces of a pile of stones and gravel. 



The solid qaartzose character ^[' the rock on St. Joseph's and 

 Sulphur Islands, so unlike the conglomerate and al'ered sand- 

 stone ,,(' Lake Superior, seems to suggest the idea of its 

 being caoic, and it is so colored on Foster and Whitney's 

 map. where, nevertheless, it is made to appear like a prolonga- 

 tion of the Potsdam sandstone of Sugar Island. The gradual 

 transition, however, from the unaltered sandstone of the Sault, 

 to the altered sandstone oi Neebish llapids and the extrem- 

 ity of St. Joseph's Island, tin- Qjiartoose sandstone and jas- ' 

 pery conglomerate of the shore west of Campement d'Ours, 

 and tin.' quartz and conglomerate of Sulphur Island, fa- 

 vors the idea of the equivalency ul" the sandstone and quartz- 

 ose rocks. The superposition of fossiliferous limestone, at 

 Sulphur Island (probably the Cliazy linn stone) immediately 

 upon the quartzite, favors the same inference, inasmuch as 

 there is in. probability that the Bandstone would not be inter- 



pOSed at this place between the Cliazy and the azoic rocks. 



the influence of the igneqne disturbances which 



have taken place at the Bruce mines and along the Canadian 

 shore hut a lew miles distant, furnish suilicient cau.se for the 



•Iteration suggested, The Canadian geologists have frequently 



aized the Potsdam Bandstone in a similar condition. 



2. — ( tu SdndtUme. 



Though this formats n. as jusl stated, is not recognized \-> 



nth ol St. Mary's Palls, it is thought host t-» em- 



i it in the enumeration, since ii is represented as playing 



an important pari in the geology of the country wesl of St. 



Maty'.- ..'. 



