482 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



THE THIRD CORE. 



This rises as a low knoll in the open field 80 rods S. 70° W. of J. A. 

 Barrett's and 10 rods north of a bluff of tuff. It is exposed with a width of 

 3 rods and a length of 5 rods. Its strike is N. 60° E. 



GRANBY. 

 THE FOURTH CORE. 



Where the Amherst-Granby road passes over the range a single house 

 (C. Harris's) stands on the west side. Eighty rods S. 65° E. of this house, 

 on a wood road at the south foot of a high conglomerate bluff, is a small, 

 nearly circular outcrop of trap with the adjoining sandstone exceptionally 

 altered on the contact. The coaly plant remains which it contains are 

 largely changed into graphite. 



THE FIFTH CORE. 



In the field west of the only other house on this road (A. Convere's) 

 and about 30 rods N. 10° W. of the house is a ridge of the trap 8 rods 

 wide, 25 rods long, running N. 50" E. a few rods north of the tuff bed. 



THE SIXTH CORE. 



In the same field with the last and about 35 rods S. 75° W. from it is 

 another high ridge, 14 rods wide and 30 rods long, having about the same 

 direction of its longer axis, the same relation to the tuff bed, and the same 

 fine-grained, dark-gray diabase without amygdaloid as have the other occur- 

 rences. Like them all, it bakes the sandstone strongly and seems to be 

 wholly surrounded by the sandstone. It is more jointed and wepihered 

 than usual. About 5 rods southeast is a dike of the diabase 10 feet wide 

 and about 5 rods long, which runs north and south parallel with a fault 

 plane a little farther east. This is very probably an offshoot from the 

 latter throat, but the junction is covered. 



THE SEVENTH CORE. 



About 200 rods north of J. McGrath's this plug occui's, at the eastern 

 terminus of the band of diabase-tuff which crosses the Notch road and 

 enters Granby from the west. This terminus is caused by the intersec- 

 tion of the tuff band by one of the main north-south faults which cross 

 the trap ridge, and the small plug of trap came up just at this crossing. It 



