24 



E. Gvee.il II — Deflected Glacial St rice. 



It is curious that these pipes should occur in the same area at 

 three different horizons, the great pipe being somewhat above those 

 of the Dwlban Point, while some seen to the north of Benllech must 

 be much lower in the series. 



V. — On Deflected Glacial STRiiE at Dwlban Point, 



East Anglesey, 



By Edwaed Greenly, F.G.S. 



THE Limestone of the foreshore at Dwlban Point is magnificently 

 glaciated, the ice-worn surfaces being preserved for a distance 

 of some yards from the Boulder-clay. The striae where undeflected 

 run N.N.E.-S.S.W., which is in agreement with the general direction 

 of the glaciation on that part of the coast. 



LimesXone 



SSW. 



Fig. 1.— Profile of Glaciated Pit. 

 The rock is not merely striated, but furrowed, and in one fuiTOw 

 a ledge of rock facing N.N.W. is undercut so as to overhang some 

 3 or 4 inches, the slope of the overhanging surface being as much 



Fig. 2. — Deflected Glacial Stki.t;, Davlban Point, Anglesey. 

 The nonnal direction of striation is that of a line joining the small round hole on the 

 left with the small fissure at * . Boulder-clay is seen in the background ; and, 

 on the right, part of a Sandstone plug in its pit. 



