QUARRY MATERIALS OF NEW YORK 1 35 



zontal system of joints is present. The quarry was formerly worked 

 in two faces, one 30 feet and the other 50 feet high, but of late 

 years the stone has been taken out without much method. The 

 opening is about 200 feet long and has been extended about an 

 equal distance back from the highway. The stone is hauled to 

 Irvington, a distance of 2 miles, for shipment. It is chiefly sold on 

 contract, so that operations are somewhat irregular. 



The principal structures in which the stone from this quarry has 

 entered are the Rockefeller and Archbold residences at Tarry town. 



Duell & Holloway quarry 



The firm of Duell & Holloway, of Tarrytown, owns a quarry 

 near Glenville, 2 miles southeast of the former town, which appears 

 to be situated in the Fordham gneiss. The rock is fine grained, 

 grayish and irregularly banded. The darker seams contain abund- 

 ant biotite and hornblende, the latter more prominent than is usual 

 with this gneiss. The texture is firmly knit, almost like that of 

 granite, and the stone is hard and tough. It shows no marked 

 tendency to split into tabular blocks, as in fact the foliation, so 

 marked in the average Fordham, is quite obscure in the hand 

 specimens from this quarry. The feldspars which are mainly 

 under 2.5 mm diameter, belong mostly to orthoclase and oligoclase, 

 the former cloudy and micasized, and the latter less altered, but 

 showing effects of compression. 



The banded structure and foliation strike N. 50 E. and dip 

 about 30 southeast. A system of nearly vertical joints is very 

 closely spaced so as to make the product more suitable for crush- 

 ing than for building purposes. The horizontal set of joints is 

 less in evidence. Granite seams occur irregularly parallel to the 

 foliation. 



The quarry opening extends about 900 feet in the longer direc- 

 tion. There is little method apparent in the operations, as the 

 principal object has been to break down the stone at the least pos- 

 sible expense without reference to the production of dimension 

 material. The output is employed mainly for crushed stone which 

 is sold in the vicinity. 



Nichols quarry 



The Nichols quarry, situated southeast of Hastings, on the road 

 to Unionville, is a continuation of the old Lefurgy's quarry which 

 at the time of Eckel's report was one of the principal quarries in 

 the Fordham gneiss. The quarry is worked by W. H. Nichols, 



