THE CONWAY SCHISTS. 



189 



summarized below, excluding- several from Ixiwlders of the Hiu.sdale and 

 Stockbridge limestones : 



- Analyses of limestones. 



THE AMPHIBOUTE BEDS. 



THE CONWAY BED. 



The geological maps of Vermont and Massachusetts represent a very- 

 broad band of hornblende-schist crossing Guilford, Vermont, and Leyden 

 and Shelburne, Massachusetts. This I could not understand, as I could find 

 only a narrow band crossing Shelburne. Later, my assistant, Mr. William 

 OiT, jr., traced the bed carefully across the Greenfield quadrangle and found 

 that it widens in the southwest corner of Guilford so as to cover a half mile in 

 area and attains a possible thickness of 2,000 feet. It narrows rapidly at 

 West Hollow Brook, and seems then to be inten-upted for 3 miles to a point 

 1^ miles east of Coleraine Center. From this point it is continuous south for 

 1 1 miles to a point a mile east of Conway. It is best studied in Brimstone 

 Hill, in Shelburne, where it is 10 rods wide, and a few rods west of the 

 Conway railroad station. It is generally a shining black, thin-bedded 

 rock, but at times the content of hornblende lessens and the rock becomes 

 gray. In its continuation northward in Vermont it becomes por])hyritic 



