AND THEIR MEETING WITH GRANITE. 8S 



have every where agitated and corroded the surface of our 

 globe. 



In order more fully to illustrate this arrangement, I have 

 drawn in figure 1st, Plate IV. an ideal portion of a coast similar 

 to that which we have been describing ; and in figure 2d, the 

 same has been exactly repeated in black lines. But in this 

 last figure, I have introduced a continuation of each of the 

 strata in dotted lines ; so that every one of them is rendered 

 completely continuous from end to end. 



This theoretical completion of these forms, may be of ser- 

 vice in accounting for the anomalous circumstances already 

 mentioned, as belonging to the strata of killas. In particular, 

 we may thus readily account for the abrupt change of dip 

 from east to west. Thus, in figure 1. Plate IV. we see the 

 strata a b, and c d, dipping rapidly to the east, and those at 

 ef, and g h, as rapidly to the west ; j^et, at their outgoings, 

 or appearances at the surface, they are very little removed 

 from each other ; and if the middle point, where the convolu« 

 tion takes place at m, were hid from the view or removed, the 

 appearance would be completely paradoxical. 



Making allowance for shifts, and various interruptions, 

 great part of the coast may be thus explained : but this simple 

 curvature, though general, is by no means universal in the 

 killas ; as appears in some places upon this coast, to the east- 

 ward of Eyemouth, at Gun's Green, where the axis of convo- 

 lution is very irregular, and is sometimes vertical ; and also in 

 Galloway, where the strata present to view much more irre- 

 gularity. But these anomalies, though more complicated, 

 seem all to be of the same class, and to denote the influence 

 of similar actions, as I shall endeavour to shew in the course of 

 this paper. 



L2 In 



