66 



GREEN MOUNTAINS IN MASSACHUSETTS. 



70 miles north of Hoosac mountain. Here, too, the Cambro-Silurian 



limestone and Cambrian quartzite (Vermont formation) are succeeded by 

 gneissic rooks in the east, which form the central divide of the Green moun- 

 tains. In the region cast of Rutland and directly south of the high mountain 

 mass of the Killington peaks there is a marked break in the general topog- 

 raphy in an east to west zone, 10 to 15 miles wide from north to south, which 

 is characterized by the flat character of the hills. The north to south ridge 

 character of the Green mountains is interrupted here, and replaced by gently 



Fig 25. Ainpliilii'liir. Same locality as 24. 



The axnpMbolite ia tnterstratifiecl here with quartzite. 



rounded elliptical hills forming an open grazing country. The railroad from 

 Bellows Falls to Rutland crosses the axis of the mountains at this place. 

 We notice that the soil is colored a deep red and soon hud that this is due to 

 the decay of masses of these amphibolites, which are interbanded with the 

 highly contorted gneisses of the region. Figs. 24, 25, '26 show this very 

 well. These bands of rock are parallel to the strata of the gneiss in most 

 cases, but here and there send out across the strata tongues which have 

 a line grain at contact and show that these rocks are intrusions. They have 

 in general a perfectly parallel structure, which curves with that of the inclos 



