REPORT OF THE DIRECTOR AND STATE GEOLOGIST 1900 rl51 

 GRANITE: IXCLUDIXG GNEISS, DIORITE, TRAP, ETC. 



Lower pre-Cambrian gneisses 

 Storm King station, Putnam co. Quarries (1) in Breakneck 

 mountain at this station formerly furnished a large amount of 

 stone for building work and also of crushed stone for railroad 

 ballast. Bailey's quarry, (1) a few hundred yards south of the 

 station, is still worked at intervals, but the output is small. 

 The rock in which the quarries are located is a medium grained 

 gneissoid granite containing a large amount of hornblende. In 

 color it varies from dark greenish to redish. A thin section of 

 this rock is shown on pi. 43. 



Carmel, Putnam co. Two quarries in pre-Cambrian gneiss are 

 located one (3) on the west side of the West Branch reservoir, 

 the other (2) on the east side of the reservoir. Both furnished 

 material for the dams and reservoir walls. 



Peekskill, Westchester co. A small quarry located near the 

 east bank of the Hudson river, about 3 miles northwest of Peeks- 

 kill, has not been worked for some years. The rock is a rather 

 coarse grained, light colored, gneissoid granite. 



Glenham, Dutchess co. A reddish gneiss has been quarried to 

 a small extent near Glenham, Dutchess co. (4). The product 

 was used for macadam on local roads. The quarry is located 

 north of and near Fishkill creek, in the small outlier of pre- 

 Cambrian gneiss which extends from near Glenham northeast- 

 ward to Vly mountain. The material is unsuitable for struc- 

 tural work. 



Theill, Rockland co. Pre-Cambrian gneiss has been quarried 

 just north of the station of the New Jersey and New York rail- 

 road at Theill, Rockland co. (5). The material outcropping at 

 the quarry is closely jointed, and breaks readily along the joint 

 planes. It has been largely used for macadam on neighboring 

 roads, but will probably be superseded by trap from the new 

 quarry south of Theill. 



Suffern, Rockland co. Several quarries (6) are worked north 

 and northwest of Suffern by Rice Bros, and the Hillburn granite 

 ■CO. The rock here quarried is a pre-Cambrian gneiss, not very 



