of the Counties of Derry and Antrim . 207 
the base of the lowest of these perpendicular precipices is 
elevated 3400 feet above the sea. 
The same style prevails on the east side of our basaltic area, 
after its boundary ceases to be the confine of sea and land ; 
for the limestone fa9ades at Garron Point, (considerably above 
the level of the sea ) exactly resemble those of Dunluce and 
Kenbaan at the water edge ; and Cave Hill ( several miles 
from the sea, and nearly one from the shallow estuary of 
Belfast , ) exhibits basaltic fa9ades at the height of one thou- 
sand feet, precisely similar, and little inferior to those of 
Magilligan . 
The exact resemblance between our inland fapades ( on the 
east and west sides of our area ) to those on the shore, proves 
them to be all effects from the same cause, and that our accu- 
mulated strata have in all these similar instances been cut 
down vertically by the same agent, and that this agent was 
not the sea. 
Nor has this powerful agent confined its operations to our 
coast, or to the periphery of our basaltic area ; we can trace 
it over its whole surface ; we find throughout its interior, simi- 
lar, though very diminutive abruptions, executed precisely in 
the same manner, that is, strata cut across by a long vertical 
fa9ade, their planes on the upper side perfectly undisturbed, 
while on the lower side all the materials of which that part of 
the stratum was once composed are completely carried off'. — 
(See bth fact. ) 
We are now unavoidably led into a discussion of a question 
which has at all times occupied the attention of naturalists. 
