ii6 



The Irish NaiMralist, 



Juue, 



(1874), gave inquiry into the origin of the drifts an important 

 impetus, for he showed that these deposits occur at a level 

 somewhat higher than 1,200 feet atCaldbeck Castle, and at 1,000 

 feet at Ballyedmonduff on the Dublin mountains ; and ex- 

 pressed his conviction that the " upper limits of these gravels 

 are clearly not raised beaches." 



Since 1874 the shell-bearing deposits have been met with 

 at considerably higher levels than 1,200; and drift-gravels 

 occur on Kilmashogue Mountain at 1,300 feet, rivalling in 

 height those at Moel Tryfaen on the oj^posite coast of Wales. 



An exhaustive account of the drifts is given in the Memoir 

 accompanying the Geological Survey Drift Map of the Dublin 

 area. The subjoined table is a summary of the lists given in 

 the Memoir and other papers. No attempt has been made to 

 revise the naming of the species or to bring it up to any 

 particular standard. 



TaBIvK of SHEI.I.S FOUND IN THF DRIFTS AROUND DUBUN. 



