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 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 oit.. p. 97. 



