MINERAL RESOURCES OF THE STATE OF NEW YORK 255 



Company once operated quarries in the area from which stone v/as 

 obtained for buildings in Paterson, N. J. Farther north are the 

 large bosses of granite known as Mt Adam and Mt Eve. The 

 stone resembles that from Pochuck mountain in general com- 

 position and appearance, being a hornblende granite with subsidiary 

 mica and having a coarse texture and greyish color. Old quarries 

 exist on the north slope of Mt Adam and the western slope of Mt 

 Eve. They were opened about 1889 or 1890. Those on Ait Eve 

 supplied considerable dimension stone for building operations in 

 the northern towns in New Jersey. Gneissic granites are found 

 along the Erie Railroad between Suifem and Ramapo, P.ockland 

 county. 



LIMESTONE 



Here are included the carbonate rocks — lim^estones and dolomites 

 — of the granular nonmetamorphic sorts that have no particular 

 value for ornamental stone. CrTstalline limestones that lack this 

 quality are also considered under this head, as well as the waste 

 product of marble quarries which finds use as crushed stone, flux 

 and for other purposes. 



New York vState has a varied assortment of limestones of which 

 there are individual representatives in most of the important geologic 

 groups. Consequently they are widely distributed over the State. 

 Practically the only large areas not well supplied with these rocks 

 are the southern section on the Pennsylvania border and the central 

 Adirondacks; the Upper Devonian strata of shales and sandstones, 

 with no considerable limestone beds, extend in a broad belt west 

 from the Catsldlls through the southern tier of counties to Lake 

 Erie, while in the interior of the Adirondacks the formations are 

 largely silicate rocks — gneisses, granites, anortliosite etc. 



Geologically the limestones range from early Precambrian to late 

 Devonian age. The oldest are represented by the Grenville lime- 

 stones of the Adirondacks and the Highlands which are thoroughly 

 crystalHne and occur in patches of strongly upturned and folded 

 strata. A later member of the Precambrian probably is the Inwood 

 limestone of Westchester county, also metamorphosed and folded. 

 It is these members that afford the marbles used for building, 

 ornamental and monumental work. Among the later formations, 

 limestones are prominent in the upper Cambrian, Ordovician, Silurian 

 and the lower portion of the Devonian systems. Here, as a rule, 

 they lie in regularly stratified beds, horizontal or but slightly dis- 



