68 NEW YORK STATE MUSEUM 



the amount of sandstone quarried, due to a decrease of all grades 

 produced except curbing and crushed stone. The amount of blue- 

 stone produced shows an increase. There was a falling off in the 

 production of the Hudson river district but a gain is shown in the 

 other bluestone districts. 



The production of bluestone by districts was as follows : Hudson 

 river, $306,005; Delaware river, $685,716; Wyoming county, $235,- 

 813; Chenango county, $130,239; other districts, $20,000. Of the 

 sandstone quarried, Orleans county reported a production valued at 

 $484,938 and other counties an output valued at $114,118. A more 

 detailed classification of the product that would cover each county 

 separately has been found impracticable, since many of the large 

 companies which operate quarries at several localities are unable 

 to divide their output according to the different sources. The rela- 

 tive rank of the principal counties of the State was, however, as 

 follows in the order of their importance : Orleans, Delaware, Ulster, 

 Wyoming, Sullivan, Chenango, Broome and St Lawrence. 



The foregoing table shows that of the bluestone quarried along the 

 Hudson river in Albany, Greene and Ulster counties, about ^2. per 

 cent was sold as flagstone and curbstone and about 23 per cent as 

 building stone. In the Delaware river districts, including Sullivan, 

 Delaware and Broome counties, the value of the flagstone and curb- 

 stone sold amounted to 83 per cent and the building stone to 16 per 

 cent of the total. In Chenango county about two thirds of the 

 entire product was marketed as building stone and the remaining 

 one third as curbing and flagging. In Wyoming county, on the other 

 hand, almost the entire product was marketed as building stone, the 

 value of the other grades being less than i per cent of the total 

 sales. The output of Medina sandstone in Orleans county was used 

 chiefly for the following purposes: building stone, 10 per cent; 

 curbing, 30 per cent; paving blocks, 54 per cent; other purposes, 

 6 per cent. 



Trap 



The term trap is commonly applied to the dark fine grained 

 rocks that occur in the form of dikes. In New York State the trap 

 is usually a diabase, a rock composed essentially of plagioclase feld- 

 spar and pyroxene, with a massive compact texture. It is very 

 common in the Adirondacks, specially along the Champlain valley 

 in Clinton, Essex and Washington counties. There are numerous 

 occurrences, also, in the region of crystalHne rocks in southeastern 

 New York, the largest being the intrusion which borders the west 

 shore of the Hudson river southward from Haverstraw and is known 



