MINERAL RESOURCES OF THE STATE OF NEW YORK 2/1 



stone, of which many examples are to be seen in the commercial 

 structures, churches etc., of New York City. The marbles are 

 mostly dolomites and are interfolded with gneisses and schists, 

 the whole series having steep dips Hke those of strongly compressed 

 strata. The geologic age of some of the limestones is Precambrian, 

 the oldest being the equivalents of the Adirondack Grenville; in the 

 northern section they may represent regionally metam.orphosed 

 Paleozoic limestones. The leading quarries at present are those of 

 the Dover Marble Co., 2 miles northeast of Wingdale station on 

 the Harlem Railroad. They yield a uniform white marble of fine 

 compact texture, that has been in wide demand for architectural 

 purposes. It is a true dolomite. The company has extensive cutting 

 and poHshing works at Wingdale station. An important quarry 

 industry existed up to a few years ago in the vicinity of Tuckahoe, 

 Westchester county, where a coarse, brilliant white stone occurs, 

 also a dolomite. The waste from the several quarries has been put 

 to use lately in the manufacture of artificial stone. A very similar 

 marble is found at Pleasant ville, Westchester county. Some struc- 

 tural marble has been obtained from Ossining, but the main part 

 of the output from this locahty is employed in lime making. 

 Magnesian limestones occur north of Peekskill, in Sprout Brook 

 valley. At Dover Plains, Dutchess county, quarries have been 

 opened in white or bluish-white marble of fine but som_ewhat loosely 

 built texture. The Dutchess County Lime Co. uses the stone for 

 building and agricultural lime. 



Besides the crystalline limestones, some varieties of the bedded 

 granular limestones that occur in the unmetamorphosed Paleozoic 

 series have ornamental qualities that class them in the trade as 

 marbles. Such quaHties may be lent by unusual color, by ground 

 pattern due to the variation of grain or the presence of fossils and 

 to the capacity of taking a high poHsh. Some have a sub crystalline 

 texture which arises from the slow action of ground waters which 

 take the carbonates of lime and magnesia into solution and redeposit 

 them in crystalline form. These limestones have not been generally 

 disturbed by regional forces, but He in horizontal or slightly tilted 

 beds, in contrast with the macro-crystaUine limestones or marbles 

 proper. The black limestone from the Trenton beds at Glens 

 Falls is of this type. It polishes to a uniform black surface and 

 has been employed extensively for floor tiles, mantles and interior 

 work. The Chazy limestone from Blufl' Point, south of Platts- 

 burgh, yields a fossil marble characterized by red and pink frag- 

 ments of crinoids in a gray partly crystalline groundmass. It is 



