REPORT OF THE DIRECTOR AND STATE GEOLOGIST 1'141 



The output of this quarry is from 1200 to 1500 squares of roof- 

 ing slate a year. The Truthville mill cuts from 5000 to 10,000 

 square feet of tiles a year. These are cut ouly to order; hence 

 the output is variable. Often much difficulty is experienced in 

 qilarrying slabs from which to cut large tiles. From 500 to 

 800 tons of slate flour are ground each year. 



Plate 30 shows the purple and green slate in the gorge of the 

 Mettowee river, in the rear of the mill. No red slate outcrops 

 along this stream. 



Quarry no. 7 was the only other one on Hatch hill which was 

 operated in the fall of 1898. It is a small opening, which follows 

 the cleavage dip downward to a depth of about 70 feet and un- 

 covers a thickness of 10 feet of unusually fine slate. Plate 31 

 shows the interior of this quarry. Before the photograph was 

 taken the workable slate was wetted, and consequently it ap- 

 pears to be of a darker color than the overlying slate, but such 

 is not the case. This quarry is operated by a horse power wind- 

 lass and employs but a few hands. The output has reached a 

 value of $250 a month. 



The dividing line between Whitehall and Granville townships 

 passes through quarry no. 5, so quarries no>s. 0-10 are in the lat- 

 ter township. 



About a mile north of these quarries is an abandoned opening 

 which exposes the only black slate noticed in this region. It has 

 been idle for several years, and the exposed surfaces show some 

 discoloration due to exposure to the atmosphere. This change, 

 however, is very uniform, and the slate shows an excellent grain 

 and cleavage. It apparently lies between the two red slate beds 

 (if the latter continue so far north), and the cleavage dip and 

 strike correspond approximately with those of the red slate. 



On the road between Whitehall and Hampton slate outcrops at 

 several points. The strike of the slate in this region alw r ays con- 

 forms to the direction of the long axis of the hill of w T hich the 

 slate is a part. It is evident that the slate formation has in- 

 fluenced the topography and has caused the series of oval hills 



