THE GEOLOGY OF MOUNT KEARSARGE 



411 



The phyllite is of a dark gray or slate color, of slightly 

 greasy feel, and is very thinly laminated. The surfaces of the 

 laminae show a fine, delicate crinkling which is seen on a cross- 

 section to be due to the beginning of a new structure almost at 

 right angles to the lamination. The new structure is produced 

 partly by a very fine faulting and partly by the compression of 



Fig. 2. — The breccia in Mt. Kearsarge — the surface of a ledge. 



minute folds. There are beds of finely grained, light gray 

 quartzite in the phyllite. They show that the present structure 

 is parallel to the original bedding of the clay. There also 

 appear on the laminae minute dark spots, longer than wide, and 

 pointed in shape, which are the beginnings of crystals, probably, 

 of andalusite. 



The phyllite mass has suffered extreme brecciation, being in 

 large part a mass of simply indurated fragments. In part there 

 is a peculiar regularity displayed in the brecciation. The break- 

 ing followed certain straight zones, only a few inches thick, 

 within which the rock was shattered, and the fragments now 



