168 GREEN MOUNTAINS IN MASSACHUSETTS. 



between localities 1 15 and 117 on the spur. In fact, judging from the many 

 alternations in the dip and the absence of the lower limestone, the whole 

 spur west of Bald mountain seems to consist of a series of minor folds whose 

 number probably varies but slightly from that represented in the section. 

 Fig. 56, p. 155, represents a specimen from locality 115 on this portion of 

 the section. In constructing the section the depth of the limestone has been 

 governed bj the angle of pitch along the spur and the relations of the Hop- 

 per and Mount Prospect (Section G) to Groodell hollow (Section J). 



About three-quarters oi a mile east of that arm of the Green river 

 known as Ashford brook the section crosses a hill known locally as 

 " Pine Cobble." ( )n the west side of it is a small limestone area cut off by 

 schist: on the north, from the Hopper limestone area, on the south from 

 the New Ashford limestone area, and on the west from the South Williams- 

 town limestone area. On the east this limest< ine underlies the Bald mountain 

 schists conformably, but on the west side it is unconformably underlaid 

 by schist, owing to a fault, the character of which has been partially 

 described under Case x, Fig. 55. There would seem to have been a sharp 

 ruptured anticline here, the eastern limb of which, consisting of the upper 

 400 feet of the lower limestone, with the overlying schist, was thrown up, 

 while the western part slid under the limestone, the break having occurred 

 along the eastern limb of the anticline in the upper part of the limestone 

 bed. This fault strikes with the fault along the eastern side of Deer hill and 

 at Sawmill hill, already described, and with the one referred to by Emmons. 

 The displacement here can not well be less than 500 to 600 feet. The 

 structure of the entire spur also indicates a great deal of compression. ' 



West of the fault the schist dips high west, or 80°, and on the west 

 side of Deer hill, a little north of this section, the limestone of the South 

 Williamstown valley occurs in contact with and under the schist, both 

 rocks dipping east. ( hi the east side of Deer hill the dips are 90°, or west, 

 indicating a synclinal structure for the central portion of that hill. 



A small ravine skirts the west brow of Deer hill, the east side of which 

 is formed by a cliff of schist, the west by a low ridge of limestone. At 



1 At locality 331, on west side of Sugarloaf, about 3^ miles south of this part of Section I, there 

 is an anticline turned over to (he west, bringing the schists under the limestone; and there are some 

 indications of a fault between them, but the evidence is not conclusive. 



