414 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



8. Again, where the road east from Pelham post-office, halfway down 

 the hill, turns fi'om south to southeast, a large outcrop of trap occui's on 

 the north side of the road. 



9. Going about 115 rods on the first western road running south from 

 the West Village of Pelham, and turning east into the woods, one finds an 

 east-west vertical dike, at one place nearly 6 feet thick, but running ^est 

 with a thickness of only 1 foot, which sends off many small branches into 

 the gneiss, one of which furnished the material for the study on page 416. 



10. On Coys Hill, in the southeast part of Ware, north of the point 

 wnere the road crosses the town line, a vertical dike of diabase occurs in 

 the high bluff northeast of the road across the ravine. It is horizontally 

 bedded, 50 feet wide, and can be followed a half mile south, first with strike 

 N. 40° E., then swinging round to N. 30° E., when it crosses the town line 

 into Worcester County. It is fine-grained and is beautifully exposed, with 

 its attendant swarm of small dikes iii the adjacent gneiss. It is now quar- 

 ried for road material just east of the station, where it is 5 rods wide. 



11. A great accumulation of bowlders of the aphanitic diabase in 

 Belchertown, north of the schoolhouse, near E. Willis's, another near the 

 center of Wales, and another in the northeast of Belchertown indicate in 

 each case the proximity of an area of the rock covered by drift deposits. 



12. About 650 feet east of the house of J. Bardwell, near the west line 

 of Belchertown, occurs an isolated outcrop of trap, forming- a hill of great, 

 broken masses of the rock. It is about 33 by 100 feet, and gneiss occurs 

 in the near vicinity on every side, though the immediate contact could not 

 be observed. The rock is the dark bluish-gray aphanitic variety common 

 in the gneiss. 



13. Just south of Flint's quarry, in Monson, a heavy dike of trap is 

 cut through l)y the quarry railroad. It can be followed but a short distance 

 to the north, when it is cut off by a fault and offset to the east, and its con- 

 tinuation, with the evidence of the faulting, can be found in the south liluff 

 of the ridge next east. From this point it can be followed northeast more 

 than half a mile, till it disappears beneath the sands in the Monson Valley 

 It is about 410 feet wide. The small dike next described is apparently an 

 offshoot from it, and the great number of trap bowlders found over the high 

 ground in the east part of Monson are clearly derived from it, and their 

 distribution makes it plain that the dike extends much farther northeast 

 and southwest than can be seen. It is now quamed for road material. 



