328 
[E.N.F.C. 
actually beating upon its face. Is it, perhaps, the deposit of 
more recent inland glaciers during the waning of the “West 
British ice,” believed by Mr. Lamplugh to- have reached its 
maximum earlier, and to have shrunk more rapidly than the 
Hibernian ice? Loose erratics at the foot of these clay cliffs 
included carboniferous limestone from Armagh, which lies almost 
due west, with sundry rocks from Slieve Croob and Slieve 
Gallion, confirming Mr. Close’s observation of N.W. by westerly 
glacial movements in the Comber and Killyleagh districts. The 
geological survey memoir just alluded to mentions certain 
striae running east and west in this district, 9 although the chief 
grinding movement seems to have been from N.N.W. to S.S.E. 
Mr. Kilroe believes these E. and W. striae to denote an earlier 
ice movement from the east, but the absence of microza in 
Killough section seems to' me almost a conclusive proof that it 
was not deposited by transmarine ice. 
I referred before to the importance of examining drift 
deposits for marine organisms, and microzoa formed our chief 
reliance owing to the remarkable scarcity of shells in our N.E. 
drifts ; they only occurred sparsely at 9 of our 36 localities. I 
once visited the celebrated glacial cliffs of Killiney, near Dub- 
lin, with Mr. Praeger, and easily collected more shell fragments 
in an hour than in seven years work round Belfast; a useful 
warning against conclusions drawn only from a single district. 
The presence of stones bored by marine plants or animals 
is another test used to 1 distinguish submarine deposits. Of 
these we only found two, one at Cloghanport and one at 
Greenisland. 
The relative proportion of underlying rocks and erratics 
was another point recorded. Glacialists are well aware that in 
many drift deposits none of the subjacent rock occurs, although 
it may be found further on in the line of movement ; also that 
in Eskers, which usually rest on boulder clay (frequently pass- 
ing imperceptibly into it at their upper ends) erratics are usually 
carried further afield than in those contained in the boulder 
9. Opus cit., p. 97. 
