LIME AND CEMENT INDTJSTKIES 787 



(pi. 39). The rock shows the usual coarse grained, fossiliferous 

 character, and the beds lie nearly horizontal with a slight dip to 

 the west. The stone is quite homogenous, and a sample analyzed 

 by the writer and representing the average of the quarry gave: 



Silica , ,. 2 . 75 



Alumina , , 1.5 



Ferric oxid , 1.6 



Lime 53.1 



Carbonic acid , 42 . 1 



101.05 



The quarries lie about 1 mile from the river and the West Shore 

 railroad. 



Herkimer county 1 



The Calciferous sandrock occurs in the county around Little 

 Falls and is well exposed in several quarries in the town and also 

 on the south side of the river. It is generally a light bluish 

 gray, fine grained, massively bedded sandy limestone whose weath- 

 ered surfaces are generally dirty buff. The following analysis 

 will illustrate well its silicious and magnesian character. 



Silica . . . 10 . 5 



Alumina , 3 . 03 



Ferric oxid 77 



Lime carbonate 47 . 96 



Magnesium carbonate. . ., 36 . 89 



99. 1; 



1 Darton, N. H. Geology of Mohawk valley in Herkimer, Fulton, Mont- 

 gomery and Saratoga counties, {see 4/th an. rep't N. Y. state mus. p. 603) 



Preliminary description of the faulted region of Herkimer, Fulton, 



Montgomery and Saratoga counties, {see 14th an. rep't N. Y. state geol. p. 33) 



White, T. G. Report on the relations of the Ordovician and Eo-Silurian 

 rocks, in portions of Herkimer, Oneida and Lewis counties, {see 51st an. rep't 

 N. Y. state mus. 1: r21) 



Vanuxem,. Lardner. Geol. 3d dist. N. Y. 1842. 



