S4 GREEN MOUNTAINS IN MASSACHUSETTS. 



to the overlying schist; strike north 10° east, dip 30° easterly. Three- 

 quarters of a mile south, in the next creek, two or three outcrops of mica- 

 ceous feldspathic quartzite strike north 10° west, dip 25° east. The curve 

 of the strike has begun here. 



Broad benches strewn with glacial drift cover this rock in all this 

 part of the mountain. At this place, opposite the north part of the town 

 of Adams, the line of junction of the limestone with the gneiss band seems 

 to make a curve westward, for we find one outcrop of this gneiss in 

 a small quarry near Adams. The strike is north 10° west, dip 25° east, 

 A few hundred yards south, in the creek marked Anthonys creek, we get 

 outcrops of a similar gneiss; strike north 8° west, dip 50° easterly. Below 

 this a few feet we find a series of outcrops of a massive micaceous quartz- 

 ite, the bedding of which dips 25° to 30° easterly and strikes north 15° 

 west. A little lower down along the road we find the Stockbridge lime- 

 stone striking north 15° west, dip 25° east: we find this within a few feet 

 of the quartzite along the road. Then in the bank there is a crumbly 

 transitional rock between the limestone and quartzite, so that the Stock- 

 bridge limestone and this quartzite seems to form the same rock, and the 

 fine grained banded gneiss appears to overlie the quartzite. 



In the canyon of Tophet creek we have cliffs of the limestone with 

 varying strike and dip. Ascending the creek, near the upper edge of the 

 canyon, we find a large ledge of massive vitreous quartzite which strikes 

 northwest and is overlaid by large loose ledges of the fine grained gneiss, 

 striking north 35° west, dip east 50°. Several hundred feet along the strike 

 south, and in the creek bed there is the conformable contact of a small 

 piece of massive quartzite overlaid east by the gneiss, both dipping east 

 and striking north 10° west. Still farther south on Tophet creek, near the 

 entrance to Bowens creek, there are extensive ledges of the fine grained 

 gneiss striking north and south and dipping east. It is therefore evident 

 that tliis. rock, underlain to the west by a massive quartzite. is succeeded 

 by the limestone, and that the limestone and quartzite pass into each other 

 bv transitions. In the canyon of Tophet creek this contact is concealed; 

 it is some hundred feet from the quartzite to the first cliff of limestone. 



For 2,000 feet east across the strike from the fine grained gneiss at the 



