430 KANGE AND EXTENT. 



the greater part of the talcoid schists dipping beneath the Eolian limestones, while a smaller portion 

 overlies the Eolian group. Thus there would be talcoid schists of two different ages. 



If on the other hand we suppose that the identity of lithological character compels us to suppose that both 

 of these patches of schist, now separated by their position, are of the same age, then we shall have no hesi- 

 tation in affirming that they are all of the age of the schists capping the limestones ; i. e., newer than the 

 Eolian limestones. 



Mt. Eolus, upon which we rely so much for determining the relative positions of rocks, is very similar to 

 Greylock in Massachusetts, which Prof. Eminons uses for a similar purpose. Greylock doubtless is the 

 southern end of the great range (though interrupted) of which Mount Eolus is the northern. 



Bange, Extent and Thickness. 



The disposition of the talcoid schists is into three different ranges, and several outliers. 

 The great range enters the State from Massachusetts at Pownal, and continues north as 

 far as Pittsford. There are three outliers in Pownal, in Manchester and in Dorset, 

 which may have been connected originally with the range. In Rutland there is a 

 curious shaped spur of schist running off from the main group. The second range 

 commences abruptly between Danby Corners and Danby Borough, gradually attenuating 

 till it comes to a point in Clarendon. It is probably a continuation of the Dorset outlier, 

 though having only a third of its width. The third range of talcoid schists extends 

 from Fairhaven to Sudbury, west of the Georgia group of cky slates. 



The first rock the traveler sees in entering Pownal from Massachusetts is the small 

 outlier of these talcoid schists. It is a belt about two miles wide, surrounded upon both 

 sides by Eolian limestones. The rocks are mostly the talco-argillaceous and talco- 

 micaceous varieties of the talcoid schists. The outlier, or possibly it may be an 

 independent deposit, passes through the middle of the town, terminating about two miles 

 from the north line, and it almost connects with the main deposit upon the flank of 

 Mount Anthony. The total length of this outlier, both in Vermont and Massachusetts, 

 is about six miles. Its prevailing dip is easterly. 



Fio. 265. 



w K\\\\\\\\\\\\\^ 



Section from Hoosac Falls to Shaftsbury. 



Hoosac River has worn away a portion of the schists of the principal range, thus in- 

 creasing the extent of surface occupied by limestone at the expense of the schists. As the 

 same erosion has acted upon the rocks at Bennington, north of Mt. Anthony, a similar 

 result is there seen. This renders the border line of the schists extremely irregular, as 

 the map indicates. The character and position of the rocks between Hoosac Falls, N. Y., 

 and Shaftsbury Center, may be seen upon Fig. 265. The general feature of this group 

 now, is that of a great range of mountains, the continuation of the Taconic range from 

 Massachusetts, and its gradual western slope. It is a range very steep upon the eastern 

 side, bordering upon the great belt of limestone ; and the precipitous nature of the moun- 

 tains is owing to geological causes. The more easily decomposing limestone passes under 



