rl62 NEW YORK STATE MUSEUM 



nomic value. Finer grained granites occur, however, and are 

 worked at several points within the area. Few of these quarries 

 are so located with regard to water transportation routes as to 

 be of more than local importance. The quarry most favored in 

 this respect is King's, located ne^r Garrison, Putnam co. Two 

 quarries near Lake Mohegan, Westchester co., are of interest 

 because of the importance of the works in which their product 

 Is used, as they supply respectively the new Croton dam at 

 Quaker Bridge and the Cathedral of St John the Divine in New 

 York city. 



New Rochelle, Westchester co. Aslis quarries. Edwin Ash of 

 New Rochelle works a group of small quarries (28) in the 

 granite area northeast of that village. The poorer grade of 

 stone is sold as foundation stone at 75c to $1 a load. The bet- 

 ter grades he uses himself on monument work. The granite of 

 this area is, in general, of very poor quality. It is often much 

 foliated and contorted. Veins and pockets of pegmatitic 

 material are scattered through it profusely. A slide showed 

 feldspar, quartz in subordinate amount, biotite present but not 

 in great quantity and a few large flakes of muscovite. The 

 feldspars present were plagioclase, microline and orthoclase. 

 Few minor accessories were present. The components noted 

 above place this rock between the granites and the quartz 

 diorites. The feldspars were much clouded. The stone is 

 hardly suitable for building purposes for though the outcrops 

 do not seem to be much disintegrated, yet the stone, in hand 

 specimens or the mass, does not have a firm and durable 

 appearance. 



Mount Vernon, Westchester co. Fairchild's quarry (27) is 

 owned by Fairchild Bros, of Mount Yernon. The quarry is an 

 opening about 200 feet long (east to west), 60 feet wide and 

 35 high, situated on the southern face of a ridge near East 

 Mount Yernon. The rock is a bluish, very tough and compact 

 granite. Slides show microline to be the predominant feldspar, 

 with some orthoclase and a little plagioclase. Muscovite is in 

 long coarse flakes and biotite in smaller flakes are present in 



