ANNALS 
OF 
PHILOSOPHY. 
DECEMBER, 1822. 
ARTICLE I. 
Sketch of the Geology of Snowdon, and the surrounding Country. 
By W. Phillips, FLS. MGS.; and 8. Woods, MGS. 
(Concluded from p. 335.) 
From the elevated ground near Capel Curig, we could per- 
ceive in the distance a more favourable atmosphere, at the time 
when rain and mist prevailed on Snowdon, and the neighbouring 
mountains. We determined, therefore, to proceed by Llanwrst 
to Conway, Bangor, and Carnarvon, and to return, if possible, 
over Snowdon. 
Between Capel Curig and Conway, we did not perceive any 
rock with which we were not already acquainted, the slates and 
lower rock of Moel Shabod prevailing every where, with the 
same direction of the slaty cleavage. We were particularly 
anxious to ascend a hill marked j in Mr. Greenough’s map, and 
which, as well as the whole range of which it forms a part, is 
there represented as being crowned by transition limestone. 
Our anxiety was increased by having been informed by Mr. 
Dawson that limestone certainly is not to be found on any part 
of that range. We ascended the hill on the eastern side of the 
valley beyond Bettws, and on traversing the whole of it, we 
could perceive no other rock, nor even any other variety, than 
such as we have already noticed. As this mountain may be 
said to be insulated, and, therefore, not forming a part of a 
range (for it does not exceed about a mile and a half in length), 
we suspected the hill marked j in Mr. Greenough’s map is part 
of a range still further east, apparently of a diflerent character, 
New Series, vou. iv. 2D 
