238 
EXCURSIONS. 
These rocks, like the beds of similar age on Langness, are 
contorted and sheared to such an extent that the original bedding 
planes are almost indistinguishable, and many dykes of Camp- 
tonite which they contain are so crushed, sheared, and drawn 
out as to be almost unrecognisable. 
Lastly, the outlier of Carboniferous Limestone at Port St. 
Mary was visited and found to belong to the same horizon as 
the beds on the other side of the bay. 
On Sunday some of the members visited the coast between 
Oob-y-Diegan and Peel. 
At Gob-y-Diegan fine exposures of the Crush Conglomerates, 
ikst described by Mr. Lamplugh, were seen to great advantage, 
the tide being very low at the time. The lowness of the tide 
also enabled the members to examine a large series of sea-worn 
caves at this point. 
Nearer Peel, a halt was made to examine the red '* Peel 
Sandstones," which have given rise to so much discussion. 
There was some difference of opinion expressed as to the 
age of these beds, but as no new evidence was forthcoming no 
definite conclusion Avas reached. 
On Monday morning the party proceeded by electric car 
to the summit of Snae Fell. The principal object in visiting 
this point was to obtain a comprehensive view of the structure 
of the island. Unfortunately this was rendered impossible by 
a thick cloud which completely covered the summit and blotted 
out the surrounding landscape. The glacial stria? which occur 
on the summit were, however, well seen. These, which run 
athwart the Island from north-west to south-east, are of very 
great interest as regards the determination of the conditions 
which obtained during the Glacial Period. 
The Isle of Man, occurring as it does in the centre of the 
Irish Sea, gives the key to the whole question of the glaciation 
of the Irish Sea Basin. 
The fact that Snae Fell is striated across its summit shows 
that the ice must have been sufficiently thick to completely 
bury the Island. While the central ridge of the Island was over- 
ridden, the lower layers of the ice seem to have swerved round 
the obstruction and flowed coastwise along both sides of the 
