of the Counties of Derry and Antrim. 
2 IS 
Proofs that our now interrupted Strata were once continuous. 
We must now turn back to the fagades of Bengore, where 
the strata themselves, and all the circumstances attending 
them, are so happily displayed, as to throw great light on the 
subject, and to lead us analogically, step by step, to the con- 
clusion we seek for. 
Let us examine and trace the summit of the precipice for a 
mile immediately eastward from the Giant’s Causeway, and we 
shall find a frequent interruption and resumption of the fourth, 
fifth, and sixth strata, at the shortest intervals, the interruption 
not always reaching to the lowest of the three, which in that 
case remains continuous : so far simple inspection removes all 
doubt, that each of these strata was once continuous as far as 
the great depression to the west of Pleskin . 
Here indeed the interruption becomes considerable, not less 
than a mile ; but when we find at Portrnoon a succession of 
three strata with the same inclination, in the same order, of 
the same thickness each, and with the same strong character- 
istic marks that distinguished the three interrupted, at the de- 
pression ; above all, when we find the strata they rest upon 
continuous (at least with very trifling interruptions) for the 
same extent ; I think we can scarcely entertain a doubt that 
this interval between the corresponding parts, though so much 
greater than any of the preceding, is, like them, but an inter- 
ruption, and that these strata were once continuous from the 
depression to Portrnoon. 
The same style of induction would establish the quondam 
continuity of all the strata in the face of Bengore promontory, 
