584 HIGH-LEVEL MARINE DEIFT AT YOLWTS BAY. [Aug. 1 898. 



at Colwyn Bay, in whicli it is well known that marine shells occur, 

 and in which he had proved that foraminifera were to he found 

 in ahuudance. The sand is quartzose, well rounded, and full 

 of Lake District erratics, and all these materials must have come 

 seawards. This marine drift rests upon a grey Till full of Welsh 

 rocks in which no erratics occur, jSTo one in the least acquainted 

 with the two types could mistake one drift for the other. His 

 object in writing the paper was to record facts ; but as the question 

 of land-ice versus submergence had been raised, he could only say 

 that all the facts which he had gathered in his study of the high- 

 level drift during the last 25 years were, in his opinion, distinctly 

 in favour of submergence. The underlying Till he considered to be 

 a product of land-ice. 



