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NEW YORK STATE MUSEUM 



Gouverneur marble gave the following results : specific gravity, 

 2.74; corresponding to a weight of 171 pounds to the cubic foot; 

 ratio of absorption .111 per cent; pore space, .305 per cent. 



The St Lawrence Company's quarries 



The quarries of this company include two openings near the 

 mill and railroad track, a little more than a mile southwest of 

 Gouverneur, and a third lying to the east on a separate vein. The 

 latter, known as the Extra Dark quarry, alone was in operation 



Fig. 15 Gouverneur marble in thin section, showing the irregular boundaries 

 between the particles and firmly interlocked texture. Enlarged 25 diameters 



at the time of the writer's visit in the fall of 19 12. It is an open- 

 ing 125 feet long, 80 feet wide and 20 to 30 feet deep. At the 

 surface the marble is of medium 'bluish color somewhat mottled 

 with white, but becomes dark blue below, which is the grade par- 

 ticularly sought, as the other quarries supply lighter stock. The 

 beds dip northwest 30 ° and pitch southwest 25 °. Two vertical 

 joint systems running N. 30 W. and N. 65 ° E. are in evidence. 

 As shown in the accompanying illustration, the quarry is crossed 

 by a vertical trap dike which is left standing as a wall; the dike 



