828 NEW YORK STATE MUSEUM 



The Calciferous is quarried near "Wliiteliall, but is very sili- 



cious. 



Wayne county^ 



The ]Sriagara limestone extends tlirongli tlie county from west 

 to east and is quarried at Walworth and Wolcott. 



HalP states that marl underlies the Cayuga marshes in the 

 town of Savannah, and is 5 to 6 feet thick. Another bed is 

 located one mile west of E'evv^ark, and a thin bed is formed, under 

 Cooper's swamp, in the town of Williamson. 



Westchester county^ 



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 

 imderlie the main valleys. The two most important are those 

 along the line of the l^ew York and Harlem railroad and the 

 Northern railroad. The former has been extensively opened up 

 at Tuckahoe and Pleasantville, and so far as examined contains 

 the better grade of stone. A third important area occurs south 

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

 Amawalk and Hastings. 



The limestones in this county are often highly magnesian, 

 coarse to fine grained metamorphosed rocks. At times they are 

 exceptionally free from silica. 



There are two important quarries at Ossining, the one belong- 

 ing to Henry Marks (pi. YS) the other to the Sing Sing lime co. 

 The stone in Mr Marks's quarry is finely granular and slightly 

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

 quarry is Avhite and coarse grained but possesses a high degree of 

 purity. 



» ,. .. ■ — _ — - - ■ ■ ■ - ■'-— '■ ■ 



1 Hall, James, {see Geol. 4th dist. N. Y. p. 414) 



2Geol. 4tli dist. N. Y. p. 416. 



3 Dana, J. D. Geological relations of the limestone belts of Westchester 

 conntv, N. Y. {see Am. jour. sci. 1880. 20: 21, 194, 359, 450, 456; 21: 

 425; 22: 103, 313, 327) 



Merrill, F. J. H. Geology of crystalline rocks of southeastern New York, 

 (see 50th an. rep't N. Y. state mus. 2: 21) 



Mather, W. W. Geol. 1st dist. N. Y. 1843. 



