ON THE TRAPPEAN ROCKS OF KILLARNEY. 
171 
of about ten miles from Killarney, on the east and north side of 
the road leading from Killarney to Macroom. Close to the road, at 
the boundary of the townlands of Carrigaree and Killeen, is a large 
mass of trap rock, of an ashy nature, haying crystals of felspar in a 
green base. Beds of greenish-gray grit dipping east at 20° seem to 
come out from beneath; the bedding of the trap is not clear. The 
cleavage is distinct, dipping S. 15° E. at 70°. A dyke of pale- 
greenish felstone cuts through it, bearing in plan N. E. and S. W.; 
a little northwards the trap changes in character, varying from a 
green ash, with ferruginous crystals of felspar, to a strong porphyry, 
with large, irregular crystals of felspar in it. The ash beds here 
have much the appearance of serpentine. Eastward of the road, and 
nearly parallel to it, runs a deep gorge, which is apparently a line 
of fault, giving a displacement of about 150 feet. Green and purple 
grits and slates on the east, striking against the trap on the west. 
At the southern end of this gorge, on the western side, is a dyke of 
pale-green felstone, running nearly east and w r est. On the side of 
the hill, north-east of the gorge, the trap is dark, green, and flaky, 
having a hornblendic appearance, and fuses easily in the reducing 
flame of the blow-pipe. The line of junction of the trap and grit 
rocks runs on the west side of, and nearly parallel to, the boundary 
between the townlands of Carrigaree and Killeen. There is no well- 
marked junction; but the boundary between the trap and grits seems 
to coincide with the strike of the latter. Going northwards along 
this boundary, the trap is generally a bluish-green, granular fel¬ 
stone, in one or two places traversed by joints, which give it a colum¬ 
nar structure. At the north side of the townland of Carrigaree, the 
trap runs east and west into the sedimentary rock, apparently resting 
in a contortion of the latter. Eastward from the point, at the road 
where the trap was first mentioned, and on the southern slope of the 
hill, is a large outlier of purple slates, green, gritty, micaceous flags, and 
strong green grits, dipping S. 45° E. at from 0° to 35°, resting on the 
trap; and S. E. of this the same beds appear overlying the trap, which 
seems to be similarly bedded. Proceeding N. E., the hill which 
slopes towards the Clydagh River is all trap, varying from a bluish- 
green to a dark, reddish-brown compact felstone, with pink flakes. 
In some places near the edge of the river, the wavy structure is well 
seen on the surface. 
South of Clydagh Bridge, the line of junction between the trap 
