784 InTEW YORK STATE MUSEUM 



Pembroke and Corfu, and Leroy. A quarry is operated by 

 J. Merrill near Batavia, but tbe greater number of quarries lie in 

 the Oorniferous at Leroy, wbere much stone is extracted. - The 

 Leroy rock is dark colored, medium to fine grained and is used 

 both for lime and furnace flux. The principal quarry at Leroy 

 is that of Morris & Strobel, but most of the quarries are at Lime 

 Hock near Leroy. The quarries are mostly small, and many of 

 the layers cherty, but those free from chert (and they are at 

 times as much as 3 feet thick) are of very good quality. The 

 following analysis of Leroy limestone from Howells quarry was 

 kindly furnished by the Tonawanda Iron & Steel co. 



Lime carbonate 92 . 46 



Magnesia carbonate .; 1 . 86 



Silica 6 



Alumina .6 



99.92 



A second analysis made of a sample collected by the writer from 

 Morris & Strobel's quarry yielded: 



Silica ,. , 5.96 



Alumina 3.16 



Lerric oxid ....... ." 1.34 



Lime 49.07 



Magnesia 1 . 44 



Carbon dioxid , 40.13 



101.1 



The third analysis shows composition of lime, furnished by 

 W. S. Brown at Leroy. 



Lime 94 



Magnesia 1.4 



Iron oxid , . 1.1 



Silica. . ! 3.2 



Alumina 3 



100 



