N! STATE MUSEUM 



fa quarried near "Whitehall, but is very sili- 



Wayne county 1 



Tlie Niagara limestone extends through the county from west 

 and is quarried at Walworth and AVolcott. 



Hall 1 that marl underlies the Cayuga marshes in the 



town of Savannah, and is 5 to feet thick. Another bed is 



:ited one mile west of Newark, and a thin bed is formed, under 

 Cooper's swamp, in the town of Williamson. 



Westchester county 8 



The limestones in this county are all of the same age, Cambro- 

 Silurian. They extend across the county in a northeasterly direc- 

 tion, forming several well marked belts which either border or 

 underlie the main valleys. The two most important are those 

 along the line of the Xew York and Harlem railroad and the 

 ithern railroad. The former has been extensively opened up 

 at Tuckahoe and Pleasantville, and so far as examined contains 

 iter grade of stone. A third important area occurs south 

 of Sing Sing (now Ossining). Other occurrences are near Somers, 

 A ma walk and Hastings. 



The limestones in this county are often highly magnesian, 

 irse to fine grained metamorphosed rocks. At times they are 

 eptionally free from silica. 



Th< ■!■<• are two important quarries at Ossining, the one belong- 



to Benry Marks (pi. 73) the other to the Sing Sing lime co. 



Thi in Mr Marks*8 quarry is finely granular and slightly 



h in tint, while the best stone in the Sing Sing lime co.'s 



white and coarse grained but pos* a high degree of 



1 ii ol. nil disk X. Y. p. 414) 



Y. p. 416. 

 31 >ns of tho limestone belts of Westchester 



n. jour. Bci. 1880. 20: 21, 194. 359, 450. 466: 21: 



I •'• J. H. illine rocks of southeastern New York. 



-': 21) 



r, W. V. • dist. N. Y. 1843. 



