Composition of Limestones and Dolomites. 31 



This analysis was made by Mr. Herbert Molson, student 

 in Applied Science. 



Niagara Formation. 



11. Grimsby, Ontario. Brownish-grey dolomitic lime 

 stone, holding a few fossils. Analysis gave : 



Calcium carbonate 68.92 



Magnesium " 29.48 



Ferrous *' 1 . 10 



Insoluble matter 0.50 



100.00 



12. Dundas, Ontario. Brownish-grey compact dolomite. 

 A specimen was found to contain : 



Calcium carbonate * 51 .85 



Magnesium " 41-65 



Ferrous " 0.62 



Insoluble matter 5.88 



100.00 

 Carboniferous ? 



13. From the Thompson River, British Columbia, 185 

 miles above Vancouver and about seven miles above Spence's 

 Bridge. A thick bed of grey limestone, well suited for 

 making lime, exposed in a cutting on the line of the Canada 

 Pacific Railway. Analysis of a specimen collected by the 

 writer gave : 



Calcium carbonate 97 . 81 



Magnesium " 1.08 



Ferrous " 0.72 



Alumina. 0. 14 



Insoluble matter 0.90 



100.65 

 Permo-Carboniferous. 



14. From Miminigash on the west coast of Prince Edward 

 Island. A reddish-grey limestone containing less insoluble 

 matter than most of the limestones found on the Island. 

 Analysis of a specimen gave : 



i Calcium car onate 78. <>7 



Magnesium " 3.51 



Alumina and ferric oxide 2.69 



Insoluble matter C , 15-49 



99.76 



