REPORT OF THE DIRECT Oil AND STATE GEOLOGIST 



r!43 



the Edwards slate eo., of Granville. There are three large open- 

 ings, in the west wall of which green and banded green and red 

 slate are exposed, while the east walls are all in red. The quar- 

 ries produce red roofing slate, and are capable of meeting al- 

 most any demand that may be made on them. The cleavage dips 

 40° e 5° s and strikes s 5° w. 



J of a mile southwest of these quarries are two small abandoned 

 openings for red slate on the farm owned by Mrs M. E. De Kalb. 

 The dip and strike in these openings are the same as in the Na- 

 tional quarries, but here the east walls show green slate and the 

 west, red. 



These facts indicate that there are two parallel red slate beds 

 here, the National quarries being located on the east bed and 

 the De Kalb quarries on the west one. The latter bed is the one 

 on which the Williams & Allen quarry is located, and the former 

 is probably identical with the bed exposed in the Eagle and the 

 Nixon quarries, described below. 



In several quarries red and green banded slate is exposed. 

 This banding is parallel to the cleavage of the slate, and indi- 

 cates that the cleavage has been developed parallel to the bed- 

 ding, a condition which is not usual, as the cleavage is formed 

 perpendicular to the direction of the pressure which caused the 

 metamorphism, and this may have been applied at any angle to 

 the plane of bedding. 



f of a mile south, on the south bank of the Mettowee river, is 

 the Williams & Allen red quarry. This is an opening about 200 

 by SO feet in area and 50 feet deep. The workable seam is 20 

 feel wide, and extends downward along the dip 70 feet, when it 

 loses its valuable qualities. The east wall is green, and the west 

 wall red " bastard " rock, as the non-workable slate is called by 

 the quarrymen. The dip is 42°. n 85° e and the strike is s 5° e. 

 This quarry was opened in May 1S9S and produced about 100 

 squares a month during the summer and autumn. Some of the 

 red layers show ribbon-like markings of a light green color, pos- 

 sibly due to the production by organic remains of acids which 

 prevented, locally, the formation of the peroxid of iron that pro- 

 duces the red color of the slate. 



