LIME AND CEMENT INDUSTRIES 781 



Lime carbonate 96 . 54 



Magnesiiim carbonate 1 



Iron and alumina oxid 84 



Silica 1 . 17 



Sulfur . .101 



Pbosphorus ,. 017 



98.668 



Some of tlie rock Is used for smelting purposes, and tlie waste 

 is burned for lime. 



Corniferous limestone. The cbief us^^ for this is also for build- 

 ing operations. The largest quarry in Erie county is tliat of the 

 Buffalo cement works, but there are numerous other smaller 

 ones. The limestone, while making a good building material on 

 account of its hardness, is very cherty in places, and therefore 

 for any chemical or similar work would probably have to be 

 hand picked. The limestone is usually thickly bedded (pi. 37). 



Essex county^ 



The pre-Cambrian rocks of Essex county often include a series 

 cf crystalline limestones, which are not infrequently speckled 

 with grains of pyroxene and other dark silicates. Occasionally 

 these silicates are segregated into bunches, thus leaving the rest 

 of the rock comparatively free from impurities. At times the 

 limestone beds attain a thickness of 50 feet to 100 feet, as at 

 Port Henry, where they have been quarried for flux. The quarry 

 has not been operated for several years. 



1 White, T. G. Geology of Essex and Willsboro townships, Essex co,. N. Y. 

 {see Trans. N. Y. acad. sci. 13: 214) 



Merrill, G. P. On serpentinous rocks from Essex county, (see Proc. U. S. 

 nat. mus. 12: 595) 



Brainard, E. The Chazy formation in the Champlain valley, [see Bui. 2. 

 Geol. soc. Am. p. 293) 



& Seely, H. M. The Calciferous formation in the Champlain valier. 



{see Bui, 3. Am. mus. nat, hist, p. 1; also Bui, 1, Geol, soc. Am, p, 50) 



Kemp, J. F. Preliminary report on geology of Essex county, [see ISili 

 an, rep't N, Y. state geol. p, 625) 



Geol. of Moriah and Westport townships, Essex co., N. Y. (see 



Bui, 14. N. Y. state mus,) 



Emmons, Ebenezer. Geol. 2d dist. 1842. 



