REPORT OF THE DIRECTOR AND STATE GEOLOGIST 1900 rl69 



Newark sandstone 



Nyack and Haverstraw, Rockland co. The reddish brown sand- 

 stones of the Newark system were formerly quarried (47) exten- 

 sively in Rockland county. At present the product is still of 

 some importance, but is used locally only. 



LOIESTOXES: INCLUDING MARBLES 



Cambro-Silnrian (?) limestones of the Highlands 



Several of the areas of white limestone in the Highlands of 

 Putnam and Orange counties have been worked for lime; a few 

 have furnished stone for local building purposes. The only 

 quarry of sufficient interest to warrant notice here is described 

 below. 



Cold Spring, Putnam co. Heustis's quarry (49), which has not 

 been worked for many years, is located about 4 miles northeast 

 of Cold Spring, Putnam co. The product, a serpentine marble, 

 was obtained from an outcrop of limestone on the western bank 

 of a small brook. In the brook thin bedded quartzite appears. 

 As both limestone and quartzite can be traced, though with 

 frequent breaks, to the northward, till the valley opens out into 

 the great Paleozoic plain of Dutchess county, it seems prob- 

 able that they are merely very highly crystalline representa- 

 tives of the Stockbridge limestone and Poughquag quartzite 

 respectively. At Heustis quarry the marble is heavily charged 

 with silicates, whose presence may be attributed to the 

 intrusion of a dike of red granite which outcrops near the 

 quarry. The serpentinous portions of the marble are not suffi- 

 ciently large or firm to warrant exploitation and the quarry is 

 merely of historic interest. 



Stockbridge and Barnegat limestones 



The Stockbridge limestone was formerly highly esteemed as a 

 structural stone, and many quarries worked it for such use. Of 

 late years, however, its popularity has declined, and only one 

 limestone quarry is now producing building stone in the area 

 under discussion. 



