THE MINING AND QUARRY INDUSTRY IQII 75 



The opening is about lOO feet square with a face of 30 feet. Most 

 of the output, which is small, is cut and dressed on the property. 



The Flannery quarry, also at Dunwoodie, is an occasional pro- 

 ducer of building material. The quarries formerly worked at White 

 Plains, Hartsdale, Tuckahoe, Hastings and Tarrytown have been 

 closed down and the lands converted to other uses. 



Fordham gneiss. The Fordham is a Hght gray banded gneiss, 

 made up of feldspar, quartz and biotite. It is regarded as a meta- 

 morphosed sediment, though in places it has been so injected with 

 granite that the igneous material predominates. The gneiss varies 

 much from place to place and even in the limits of a single quarry. 

 Its use, consequently, is mainly for rough stone in foundation work. 



The quarry owned by Patrick Reilly in the village of Dublin, 

 Westchester county, has been one of the few producing building 

 material. It has been worked more or less actively for the past 35 

 years, and recently has been under lease to Thomas Murphy of 

 Irvington. It is opened for a width of 200 feet, with a face from 

 30 to 50 feet high. The rock is hard, much contorted gneiss, 

 seamed with granite and pegmatite. It has been used in several 

 residences and for some local public buildings. 



The Lefurgis quarry, near Unionville, consists of an opening 

 about 100 feet wide with a face of 30 feet. It aifords building and 

 rough stone and is to be equipped with a crushing plant. It is 

 operated under lease by WiUiam Nichols, jr. 



A quarry at Glenville is worked by Duell & Holloway for crushed 

 stone. The old quarries at Uniontown, Bryn Mawr, Lowerre and 

 Fordham are no longer active. 



Storm King granite gneiss. The granite exposed on Storm 

 King, Breakneck, Crow's Nest and other prominences in the north- 

 ern Highlands represents the most considerable body of that rock 

 in massive or slightly modified condition existing anywhere in the 

 southeastern section. It belongs doubtless to the early Precambric 

 series, older than the small granite intrusions around Peekskill. Its 

 appearance in places is that of a medium to coarse massive granite, 

 but more often it shows a distinctly gneissoid arrangement of the 

 minerals and more or less crushing effects. It is a strong and very 

 durable stone that has been used mainly for rough construction 

 and crushing purposes. Its color ranges from medium to dark 

 according to the relative proportion of hornblende that is admixed 

 with feldspar and quartz, the general tone being reddish or 

 greenish. There are quarries and crushing plants at the base of 



