Junction of Trap and Sandstone. 



109 



turnpike, from the south, will be at {k), in the form of a small peak 

 rising considerably above the adjacent country, with a dyke* at the 

 south-east corner of its base, cutting across the road, and seen in the 

 west bank of the same at (/), or in the side of the hill descending 

 from the turnpike to the road on the bank of the river, where it ap- 

 parently terminates the dyke. At (m) and (o) in the same bank of 

 the turnpike, may be seen two other dykes, which, though covered 

 with diluvium, except in the bank, judging from their direction and 

 the form of the land, are evidently connected with the peak [k), 

 and probably with the dyke (a b). From {b) two other dykes (c) 

 and (i), branch off and pass up the side of the mountain, near the 

 road leading to Cheshire. At (c) the trap is rudely columnar, and 

 the columns considerably inclined eastward, or down the hill towards 

 the road. The dyke {if) is probably connected with the dyke (cj) 

 at the upper end, but this connection is inferred for the same cause 

 and on the same ground as the connection of the dykes (mo). At 

 (j) the dyke presents a mass of trap lying over and upon the sand- 

 stone, the upper surface of which is extremely irregular. Figure 4 

 presents a profile view of a section of this place. 



Fig. 4. 



At {d fig. 3,) in the north bank of the road, or rather in the bed 

 of the ditch at the side of the same, may be seen a dyke cut- 

 ting through the sandstone, evidently connected with the dyke 

 {if), and probably with the peak {k). At (e) is another dyke cut- 

 ting through in the same manner, connected at (p) fig. 3, with the 

 ridge (c, a, b,) fig. 5, and most likely with the peak {k). 



* We have seen most of the dykes described in this paper, and can bear testimo- 

 ny to the correctness of Mr. Chapin's account. — Ed. 



