t160 new YORK STATE MUSEUM 



The quarry has been idle during recent years. The opening is 

 about 100 feet long by 100 wide and 20 deep. The best stone, 

 which is a very fair grade of Yonkers, is at the west side, the 

 eastern side and center showing very thin-bedded stone. The 

 quarry is shown on pi. 19. 



Valentine quarries (16). Several small openings exist nearer 

 Dunwoodie. It is stated that these were worked eight or 10 

 years ago. This information, taken together with their loca- 

 tion, makes it probable that they are the quarries described by 

 Smock as the Valentine quarries and mentioned by Mather in 

 1813. At any rate, they are of historic interest as being the 

 first quarries operated in the Yonkers gneiss belt. 



Millwood, Westchester co. Quarries (21), formerly much worked 

 for railroad ballast, occur at Merritt's Corners (Millwood), on the 

 Kew York and Putnam railroad. The rock is a reddish gneiss, 

 resembling some phases of the Yonkers gneiss. The foliation 

 strikes n. 32° e. and is almost vertical in dip. 



White Plains, Westchester co. Collin's quarry (22) is located 

 about 1 mile northeast of Silver lake, the quarry being shown 

 on pi. ol. The material shown in both the openings is a fairly 

 well foliated reddish gneiss of the Yonkers type. It is heavy 

 bedded, and the horizontal joints are far enough apart to permit 

 the extraction of good sized blocks of stone. At present the 

 local demand is insufficient to warrant steady working. 



Hartsdale, Westchester co. McCabe's quarry (20) is situated 

 about 1 mile east of Hartsdale station, in a narrow belt of Yonk- 

 ers gneiss. The rock is of fair quality. Little has been used 

 ior structural work as rough stone; but a considerable quantity 

 has been supplied for macadamizing roads in the vicinity. 

 The material exposed is very light bluish in color and highly 

 foliated. 



Hastings, Westchester co. Eowley's quarry (23), situated a lit- 

 tle east of the old aqueduct and a mile or less south of Hastings, 

 is in a rock which may be considered Yonkers gneiss. Rowley's 

 quarry was worked for a time to supply stone for a bridge. on 

 Warburton avenue. The stone obtained was too folded and dis- 



