DEvSCKiri i\i'; noii:;; oh (Hiakkv distimcts AND ^hjarkiks 229 



rocks ol lli(' I I iv.liI.iiHl. of the Iliidson and Ix-Idii^Mo what 

 has l)(M-ii (Icsi^nahMl th<* " iVlaiihattan jn'onj)."^" 



New York City, Fordliani. A micaceous jniciss is (juar- 

 ricil on iIk* |)i()|)('i-|y of S(. John's ('r)llej^c, on the corner of 

 the I^)nh>var(l and Telhain avenne. It is of a hhiish^ray 

 sha(h" ol ( ()h)i-, and is known hxally as " l)hiest one." 'Hie 

 new buildings of the: college are ccjnstnicted of this 

 stone. 



Hartsdalc, Westchester County. - Oneissic rock is (\\\;ir- 

 ricd n(\ar Ilartsdale station on the IJarleni railroad for the 

 local niaiket. The county buildings at White Plains are 

 built of this stoiK^ 



South-cast of White Plains, gneiss is rjuarrie.d and an 

 example in construction is seen in the M. \i. church on the 

 main street. 



Scarsdalc, Westchester County. — The Seely quarries are 

 a half mile west-north-west of the Scarsdale station, and 

 near the road to Cireenvllle. Tlu! stone obtained from this 

 locality consists of f(!ldspar, (|uartz, hornblende and a little 

 black mica, and these minerals in parallel lines give it a 

 foliated aspect. The exposed ledges nc^ir the quarry are 

 fnan and solid and show very little alteration due to 

 weathering. 'Idiis stone has been used in bridge work, for 

 the Bronx river aqueduct, and also in the Williams Bridge 

 reservoir gate house. 



Hastings, Westchester County — There are three quarries 

 in the vicinity of Hastings. One is owned and worked by the 

 N. Y. C. & H. R. R. R. Co., one mile south of the railroad 

 station. The Munson quarry is three-quarters of a mile 

 east-south-east of the village, and adjoining it on the same 

 ridge is the Ferguson quarry. 



The stone of these quarries consists of orthoclase, quartz, 

 hornblende and biotite, arranged generally in parallel lines 

 or thin layers, which gives the rock a gray and striped ap- 



* Metamorphic'Strata of Southeastern New York, by F. J. H. Merrill, Am. Jour, 

 of Science, Vol. xxxix, pp. 389-390. 



