1 9^5 WkiGHT. — The Post-Glacial Levels of Lough Neagh. 67 



expect to find a complete absence of submerged tree stumps 

 or a submerged shore platform in this part of Lough Neagh. 

 We ought on the other hand to find an abandoned shore-line 

 a few feet above the surface of the lake at the head of the 

 bay. It should be a perfectly simple matter to find out 

 if this really is the case, and it is an enquiry well worth 

 making, for, as has been pointed out above, it might easily 

 lead up to a determination of the total amount of post- 

 Glacial tilting. 



I understand that the level of the lake has been con- 

 siderably lowered by drainage within modern times, so that 

 the water at the present day does not reach to the base of 

 the cliff. This introduces a complication in the making 

 of certain observations though it may facilitate others. 

 For instance, it might be necessary to use a theodoHte or 

 some kind of level to find out if the abandoned shore -line at 

 the head of Antrim Bay is higher than elsewhere. Measure- 

 ments should be referred to the present water-surface, but 

 they should be made on the same day or else a gauge post 

 should be put up in the water for recording the change of 

 level between the several observations. 



I think Mr. St elf ox's suggestion as to a possible record of 

 tilting in the Lough Neagh basin is one of the most valuable 

 put forward in recent years in connection with this problem, 

 and I hope he will pursue the subject and make definite ob- 

 servations of his own in connection with it. If he cannot 

 find an opportunity to do this I shall some day try to make 

 one for myself, but I live far from the district, and Mr. 

 St elf ox is within easy reach of it. 



Geological Survey, Dublin. 



