SS GREEN MOUNTAINS IN MASSACHUSETTS. 



this rook) for nearly 500 feet, then rising more steeply to the summit of 

 this ridge, where we rind the albite schist with the same strike, but greatly 

 (•rumpled dip. There are no outcrops between the top of this bluff of lime- 

 stone and the schist, about 3,000 feet horizontally. No outcrops are found 

 for a mile south of this place along the strike, then we find the limestone in 

 a small quarry, striking north 3;")° east, dip 35° east. This limestone at the 

 top of the quarry is conformably overlaid by a black schist, and 50 feet dis- 

 tant across the strike an outcrop of the typical Hoosac schist has the same 

 strike, crumpled in small folds with a northerly pitch. It looks very much 

 like a transition from limestone to schist at these places From here there 

 are few outcrops down to the West Portal, where the schist entirely runs 

 out just north of the tunnel. There seems to be in this ridge a trough of 

 schist with a pretty steady north to south strike and crumpled dip. The 

 outcrops can be traced along the summit of the ridge almost continuously 

 The northern area of schist overlying the Vermont conglomerate south 

 of Spruce hill soon turns from the east and west strike as we go east to the 

 steady north and south strike of the eastern border, and runs from here with 

 an almost straight line to the southern border of the sheet. The conformable 

 contact with the white gneiss (Vermont) at the pond (Profile v, PI. v) 

 has already been mentioned; the line of contact runs about 9 miles to a 

 point about 1 mile northeast of Windsor Hill, where the contact is well 

 shown between the fine grained white gneiss and the schist: strike north 

 20° east, dip steep east. There are here transitional beds between the 

 gneiss and schist formed by very micaceous layers. Over a mile due east 

 of Windsor Hill the same thing occurs again; the schists are here very 

 garnetiferous. The Rowe schists, which lie east of and hence overlie the 

 Hoosac (albite) schist, have been mentioned previously. They appear 

 on the map (PI. i) as a narrow strip at the eastern edge, passing into the 

 Hoosac schist at the line of contact. They will be described in their more 

 general relations in a forthcoming memoir of Prof. B. K. Emerson covering 

 the territory east of the map. 



THE REGION SOUTH OF CHESHIRE AND OF THE HOOSIC VALLEY. 



The area of gneisses (Vermont formation) south and southeast of the 

 granitoid gneiss can best be described by beginning at the southwest end. 



