28 Canadian Record of Science. 



A small quantity of the stone has been used for making 

 lime. 



Levis Formation. (Siluro-Oambrian.) 



2. From Little Metis Bay on the Lower St. Lawrence, 

 where thin bands of impure rusty-weathering dolomite are 

 interstratified with black shales. A specimen from one of 

 these bands gave on analysis : 



Calcium carbonate 35 . 46 



Magnesium " 26 .40 



Ferrous '' 4.67 



Insoluble matter 32.19 



98.72 

 It was in the black shales of this locality that the fossil 

 sponges described by Sir William Dawson and Dr. Hinde 

 were discovered. 



3. From the third range of Wickham, in the Eastern 

 Townships. A blackish-grey limestone with somewhat 

 conchoidal fracture. The dark colour is due to the presence 

 of a little carbonaceous matter, which, however, burns away 

 during calcination, leaving a buff-coloured lime from which 

 gelatinous silica separates on treatment with h} drochloric 

 acid. Analysis gave : 



Calcium carbonate 70.53 



Magnesium " 6 . 77 



Ferrous " 3.02 



Alumina 3.85 



Silica 15 . 95 



Carbonaceous matter undt. 



100.12 

 4 The limestone used in the blast-furnace at Drummond- 



ville, P. Q., and probably from the Levis formation of that 



region. Analysis gave : 



Calcium carbonate 52 . 12 



Magnesium " 3 . 86 



Ferrous " .... 4.82 



Alumina. 2.93 



Insoluble matter 35-50 



Copper traces. 



99.23 



