■ GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 295 



has been entirely removed by the drift, and that remaining is forced to 

 dip to the north. About a stone's throw distant to the west, the normal 

 dip to the north-west appears again. If the slate dipped underneath the 

 Lyman beds, the latter would have been eroded, instead, and made to 

 disappear. This and other similar facts indicate that the Lyman rocks 

 in this field constitute a hard, irregular floor, upon which the slates were 

 placed by deposition. When lateral pressure was exerted upon this ter- 

 ritory, the floor would be disposed more unevenly than at first, and the 

 upper and more yielding rock be forced to accommodate itself to it. 

 Hence the slates would be bent, broken, and thus put into proper con- 

 dition to be removed largely by later erosive agencies, permitting us to 

 see the natural limits of their distribution by imagining the scattered 

 remnants left once joined together. 



The main range of Lyman schists in Bath widens in proceeding north- 

 erly. At J. Hastings's it dips north-westerly, as usual. The most inter- 

 esting feature connected with it is the branching to the east of a mass of 

 both the white and greenish schists, so connected together as to make it 

 difficult to decide whether both the Lisbon and Lyman groups may not 

 be present. The road from the school-house, about a mile above the 

 mouth of Smith brook, passing over the hill by J. Dow's, E. McAdair's, 

 etc., crosses over a band of green schists about half a mile wide. If we 

 pass towards the conglomerate from where these exposures appear, we 

 find them cut off by a shelly slate, and discover beautiful examples of 

 contorted strata. Hence a dislocation is evident, whose position is ap- 

 parent upon the map, having a north-westerly course. The green schists 

 occupy the middle portion of this area, where they cross into Lyman. 

 The whole area is about three thousand feet wide on the town line, some 

 four hundred feet on the west, and fifteen hundred feet on the east, being 

 of the whiter variety. The green schists run north-easterly about three 

 thousand feet into Lyman, and their place is taken by the whiter layers 

 further on. But there are green schists in a band five hundred feet wide, 

 tapering to a point, reaching from the school-house to a ledge past the 

 Bedell mine. The latter range is covered by clay slate. 



Reference should now be made to the numerous observations recorded 

 upon the special map of four square miles' extent in the south corner of 

 Lyman, surveyed with great pains for the purpose of elucidating the 



