REPORT OF THE DIRECTOR AND STATE GEOLOGIST 1900 rl63 



about equa4 quantity. Tlie grain is small and the feldspars 

 fairly fresh. The rock is so thinly and irregularly jointed that 

 it is not much used for building stone. Even with great care, 

 not over 5^ to lOfo of the total product could be gotten out in 

 large enough blocks to use for structural purposes. At present 

 it is crushed at the quarry and sold for local use as macadam. 

 A 40 horse power boiler runs the drills (McKiernan) and a 

 Brennan crusher (18 horse power engine). The crusher can 

 turn out 50 to 65 yards of crushed stone a day. The stone was 

 first used in building macadam roads in 1891. It was found 

 that the granite does not grind up into impalpable dust as does 

 trap or limestone but in dry weather loosens up into a heavy 

 dust about the character of coarse sugar, and on being watered 

 packs down again into a hard road. The roads in their wearing 

 quality have exceeded expectations, particularly where the road- 

 bed was on wet soil. The white color of the road is somewhat 

 objectionable during the summer on account of the glare. 



Lake Mohegan, "Westchester co. Intrusive granites are being 

 extensively quarried at two points about 1 mile south of Lake 

 Mohegan. All the product of both quarries is used as cut stone, 

 that from the northern quarry (30) in the new cathedral (St 

 John's) in New York city, while that from the southern quarry 

 (29) is used on the new Croton dam at Quaker Bridge. The 

 stone is a yellowish to pinkish, medium grained granite, dis- 

 colored in places apparently by decay of its contained biotite. 



Garrisons, Putnam co. King's quarry (31) is located about 2J 

 miles south of Garrisons, Putnam co., and J mile east of the 

 Hudson river. It is owned by the King granite co. and is at 

 present operated under lease by Doern & Sons of New Rochelle 

 N. Y. 



The opening is about 300 by 200 feet in area and 50 feet deep. 

 Little water is encountered. The rock is a fine grained, light 

 gray granite, intrusive in the pre-Cambrian gneiss, and is shown 

 in section on pi. 52. The main set of joints strike nearly north 

 and south, and dip about 70° to the east. A prominent hori- 



