es 
= 1886] ~- North America, Great Britain and Ireland. g2t 
an 
An 
-filled 
the eskers were held to be phenomena due to the melting of the 
ice and the circulation of subglacial waters. The Irish ice-sheet f 
seemed to have been joined at its north-eastern corner by ice 
coming from Scotland across the, North channel. All the evi- 
dence collected indicates that a mass of Scotch ice, reinforced by 
that of Ireland and England, filled the Irish sea, overriding the 
Isle of Man and Anglesey, and extending at least as far south as 
‘Bray Head, south of Dublin. A map of the glaciation of Ireland 
was exhibited in which the observations of the Irish geologists 
and of the author were combined, in which was shown the central 
sheet, the five local glacial systems, all the known striæ, and the 
probable lines of movement as indicated by moraines, striae and 
the transport of erratics. 
The glaciation of Wales was then considered. Wales was i 
shown to have supported three distinct and disconnected local | 
Systems of glaciers, while at the same time its extreme northern * 
border was touched by the great ice-lobe of the Irish sea. The 
_ Most extensive local glaciers were those radiating from the Snow- 
den and Arenig region, while another set of glaciers radiated 
from the Plinlimmon district and the mountains of Cardiganshire, 
nd a third system originated among the Brenockshire beacons. 
a The glaciers from each of these centers transported purely local 
boulders and formed well-defined terminal moraines. The north- 
ern ice-lobe, bearing granite boulders from Scotland and shells 
and flints from the bed of the Irish sea, invaded the northern — 
coast but did not mingle with the Welsh glaciers. It smothered 2 
iglesey and part of Carnarvonshire on the one side, and part of ee 
with far-traveled northern erratics, is heaped up in hum- ^ 
Mocks and irregular ridges, and is in many places as characteris- Se 
tically developed as. anywhere in America, It has none of the. 
racters of a sea-beach, although often containing broken shells 
alg from the Irish sea. It may be followed from the extreme 
nd of 
os 
oO 
E 
a 
ab 
D 
pias 
= 
= 
3 
or 
a’ 
= 
— 
oO 
aas 
ai 
S 
Sp 
: 
l Tryfan and along the foot of the mountains east of Menai re : 
Strait to Bangor, where it goes out to sea, reappearing further east 
Onway and Colwyn. It turns 5outh-eastward at Denbigshire, 
past St. Asaph and Halkin mountain. In Flintshire it 
a 
