7 6 



NEW YORK STATE MUSEUM 





Production of sandstone in 



1914 







DISTRICT 



BUILD- 

 ING 

 STONE 



CURBING 



AND PAVING 

 FLAG- BLOCKS 

 GING 



CRUSHED 

 STONE 



RUBBLE, 

 RIPRAP 



ALL 

 OTH R 



Bluestone 

 Hudson river 



$5 500 



20 I96 



69 255 

 92 20I 



4 087 



$153 436 

 177 200 



5 812 



1 000 



40 









$1 559 

 9 865 

 2 337 



Delaware river . 







$1 425 

 96O 



1 393 



Chenango county 



Wyoming county 



Other districts 









$48 













Total bluestone. . . 



$191 239 



$337 488 





$48 



$3 778 



$13 76i 



Sandstone 



Orleans county 



Other districts. 



$15 926 

 10 343 



$147 970 

 4 764 



$266 775 

 12 912 



$36 O95 



$1 319 

 6 927 



$7 645 



Total sandstone . . 



$26 269 



$152 734 



$279 687 



$36 O95 



$8 246 



$7 645 



Combined total.. . 



$217 508 



$490 222 



$279 687 



$36 143 



$12 024 



$21 406 



•TRAP 



Trap is not a distinct rock type, but the name properly belongs 

 to the fine-grained, dark-colored igneous rocks that oc ur in in- 

 trusive sheets and dikes. In mineral composition it differs from 

 most of the igneous rocks that are classed in the trade as granite 

 by the prevalence of the basic plagioclase feldspars and- the higher 

 percentages of the iron magnesia minerals, while it contains no 

 quartz. Some of the so-called " black granites," however, are trap. 

 The name is sometimes applied to fine-grained rocks of granitic or 

 syenitic composition and sometimes even to rocks of sedimentary 

 derivation, but such usage is misleading and indefensible. 



The particular value of trap is due to its hardness and toughness. 

 Its fine, compact, homogeneous texture gives it great wearing pow- 

 ers and it is eminently adapted for road metal and concrete of 

 which heavy service is required. The principal product, therefore, 

 is crushed stone. It has been used to some extent, also, as paving 

 blocks, but these are rather difficult to prepare, since trap very 

 seldom shows any capacity for parting comparable to the rift and 

 grain structures of granites. As a building stone it finds very little 

 application, probably on account of its somber color. The expense 

 of cutting and dressing trap is also an obstacle to its employment 

 for building or ornamental purposes. 



The trap quarried in New York State is properly a diabase. Its 

 mineral composition varies somewhat in the different occurrences, 



