LIME AND CEMENT INDUSTEIES 813 



Lower stone^ Howard's quarry, Ogdensburg : 



Silica 17.28 



Alumina 6.21 



Ferric oxid .92 



Lime carbonate 58 . 17 



Magnesium carbonate 18.46 



100.04 



Tbe crystalline limestones form a belt many square miles in 

 extent, stretching in a northeast and southwest direction ; in addi- 

 tion there are small scattered patches, which are irregularly dis- 

 tributed throughout the county. According to Smyth the largest 

 limestone belt is that which is traversed longitudinally by the 

 Rome, Watertown and Ogdensburg railroad, and extends from 

 Antwerp to a point 2 miles east of De Kalb Junction. While it 

 is thus seen that the limestone underlies a considerable area, at 

 the same time, owing to a scarcity of outcrops, its presence is not 

 always noticeable. The linear extent of this belt from Antwerp to 

 its probable end in Canton is 35 miles. Its width in a northwest 

 and southeast direction is variable. It is 2 miles at Antwerp, 

 6 to 8 at Gouverneur, but then narrows again. The limestone 

 is highly crystalline in character, and varies in color from a white 

 to a dark bluish gray. It is unfortunately often rendered impure 

 more or less by scattered grains or somewhat similar masses of 

 minerals, of which the most important are serpentine and trem- 

 olite. In some localities these crystalline limestones reach a high 

 degree of purity. The following two analyses were kindly fur- 

 nished me by Prof. Priestley, of St Lawrence university. 'No. 

 1 is a stone used for lime from a locality on the road to Colton 

 and 6 miles from Canton. No. 2 is from Steven's quarry on 

 Grass river 1 mile above Canton. The second one is not used 

 for lime. 



