LILLE AND CEMENT INDUSTRIES 785 



Overlying the gypsum beds which occur in the town of Leroy 

 there is occasionally found a drab limestone resembling cement 

 rock in appearance. The following analysis was made of a sample 

 from the land of Mr Howell near Leroy, D. IT. !Newland, analyst. 



Silica 4.02 



Alumina 1 . 48 



Ferric oxid 1.07 



Lime carbonate 57.87 



Magnesium carbonate 35 . 09 



99 53 



This composition would not indicate that the material had very 

 great hydraulic properties, as it runs low in clay. 



According to Hall 1 the hydraulic limestone is exposed on 

 Aliens creek, 2 miles north of Leroy, and also at Morganville. 



Genesee county contains several swamps underlain by marl. 



One extensive deposit occurs along the line of the New York 

 Central railroad about a mile west of Bergen, on the land of 

 P. Snyder, and Gr. E. Parish and also on what is known as the 

 Doran farm. Attempts have been made to organize a Portland 

 cement company to work the material. The following analysis 

 made by J. A. Miller, of Niagara university, was furnished. 



Silica 49 



Alumina and ferric oxid .* 35 



Lime sulfate 3 . 48 



Lime carbonate 94.12 



Magnesia tr. 



Undetermined 1.56 



100 



Marl is also said to underlie the Beaver Meadows at Leroy. 

 i Geol. 4th dist. N. Y. 1843. p. 4G5. • 



