THE MINING AND QUARRY INDUSTRY I907 7 1 



building stone, the decrease being distributed over all the differ- 

 ent districts. There was little change in the values of the other 

 materials from those reported in 1906. The combined total of 

 sandstone quarried on the other hand showed an increase. 



The production of bluestone by districts was as follows, the 

 figures for 1906 being in parentheses : Hudson river $293,895 

 ($306,005) ; Delaware river $703,428 ($685,716) ; Wyoming county 

 $196,769 ($235,813) ; Chenango county $106,703 ($130,239) ; other 

 districts $15,132 ($20,000). In the Hudson river district of 

 Albany, Greene and Ulster counties, about 65 per cent of the 

 output in 1907 was sold as flagstone and curbstone and about 21 

 per cent as building stone. In the Delaware river district in- 

 cluding Sullivan, Delaware and Broome counties, the value of 

 the flagstone and curbstone sold amounted to about 88 per cent 

 and the building stone to 11 per cent. In Chenango county 

 about 60 per cent of the entire product was marketed as build- 

 ing stone, while in Wyoming county practically the whole output 

 consisted of that material. 



The production of Medina sandstone in Orleans county last 

 year was valued at $542,218, as compared with $484,938, the value 

 of the output in 1906. This stone has come into wide use for 

 street work owing to its durability and even wear, and is also 

 an attractive building material. The quarries at Albion, ^Medina, 

 Holley, etc., are large and well equipped. 



Trap 



The term trap is commonly applied to the dark fine grained 

 igneous rocks occurring as dikes or sheetlike intrusions. The 

 variety known as diabase, composed essentially of plagioclase 

 feldspar and pyroxene in small interlocking crystals, is the most 

 common in Ncav York State. The dikes are well distributed 

 throughout the eastern Adirondacks, particularly in Clinton and 

 Essex counties, but they are usually too small to be workable. 

 The dikes near Greenfield, Saratoga co.. and at Little Falls, Her- 

 kimer CO., are exceptional in size for that region, having a thick- 

 ness of 200 feet or more. By far the largest occurrence in the 

 State is that on the west side of the Hudson river, south of 

 Haverstraw, which forms the remarkable scenic feature known 

 as the Palisades. The southern end of this intrusion is found on 

 Staten Island where it extends southwest from Port Richmond. 



The principal use of trap is for crushed stone for roadmaking 



