no 



Junction of Trap and Sandstone. 



After leaving the dyke (e), 

 fig. 3, passing up the hill, we 

 cross dykes at (n, k,j,g, e 

 and c), all of which are evi- 

 dently but ramifications of a 

 ridge, or large dyke running 

 north of the road and nearly 

 parallel to it. 



The distance from the ri- 

 ver, fig. 3, to (c) fig. 5, is 

 about seventy rods, and the 

 distance between the dykes 

 (b and c) fig. 3, is about for- 

 ty rods. The width of the 

 different dykes is various ; 



(d) fig. 3, is about four feet ; 



(e) about eight feet ; (n) fig. 

 5, from one to two feet in 

 different parts of its course ; 

 (k) about three feet ; (j) 

 about six feet ; (/and e), in 

 the north bank of the roadj 

 from thirty to forty feet. 



The two dykes (w and k) 

 are connected on both sides 

 of the road, completely surrounding the sandstone, and I think it more 

 than probable that they unite at some distance below the surface, be- 

 neath the sandstone, thereby separating the same from its original 

 connection with the strata, and giving it the form of a large fragment of 



1. Road to Cheshii-e. 2. Deep dell. 3. Brook. 



sandstone resting on and surrounded by 

 trap, as in the two places already describ- 

 ed. The dyke (ij) is probably connected 

 with the dyke {o,n, k), the evidence how- 

 ever is only presumptive, but all the other 

 connections marked on fig. 5, are appar- 

 ent. At (c, d, e,/and g), are fragments 

 of sandstone surrounded by trap. 



Of these fragments, (e) fig. 6, is a por- 

 tion of sandstone stratum, about ten 



Fig. 6. 



