92 



NEW YORK STATE MUSEUM 

 Production of marble 



VARIETY 



1911 



1912 



1913 



Building marble 



$171 748 

 79 115 

 27 178 



$155 4ii 



84 5ii 



1 925 



$127 556 

 81 330 

 43 406 



Monumental 



Other kinds 





Total 



$278 041 



$241 847 



$252 292 





SANDSTONE 



Under sandstones are included the sedimentary rocks which con- 

 sist essentially of quartz grains held together by some cementing 

 substance. Among the varieties distinguished by textural features 

 are sandstones proper, conglomerates, grits and quartzites. 



Of the sedimentary rocks which occur in the State, sandstone has 

 the largest areal distribution, while in economic importance it ranks 

 second only to limestone. Nearly all the recognized stratigraphic 

 divisions above the Archean contain sandstone at one or more hori- 

 zons. The kinds chiefly quarried are the Potsdam, Hudson River, 

 Medina and Devonic sandstones. A few quarries have been 

 opened also in the Shawangunk conglomerate and the Clinton and 

 Triassic sandstones. 



The Potsdam of the Upper Cambric is the lowest and earliest in 

 age of the sandstones that have a fairly wide distribution and are 

 utilized for building purposes. The most extensive outcrops are 

 along the northern and northwestern borders of the Adirondacks, 

 in Clinton, Franklin, St Lawrence and Jefferson counties. Other 

 exposures of smaller extent are found in the Lake Champlain val- 

 ley and on the southeastern edge of the Adirondack region. These 

 latter areas represent the remnants of a once continuous belt that 

 has been broken up by folding, faulting and erosion. The Pots- 

 dam sandstone has in many places the character of a quartzite, 

 consisting of quartz grains cemented by a secondary deposition of 

 quartz, and then is a very hard, tough and durable stone. The 

 quartzite from St Lawrence county has sustained a crushing test 

 of more than 42,000 pounds to the square inch. The color varies 

 from deep red to pink and white. The principal quarries are near 

 Potsdam and Redwood, St Lawrence county, and Malone and 

 Burke, Franklin county. Besides building stone, which is the chief 



