I904- 291 



THE PRE-GLACIAL RAISED BEACH OF THE SOUTH 



COAST OF IREEAND.' 



BY W. B. WRIGHT, B.A., AND H. B. MUFF, B.A., F.G.S- 



Ai,ONG the greater portion of the northern shore of Courtmac- 

 sherrj' Bay there stretches a remarkabl}^ smooth platform of 

 rock about 5 feet above high-water mark. At a varying 

 distance from its seaward edge it disappears beneath a mass 

 of drift. The drift deposits lie on the waterworn platform, and 

 are banked against a cliff or slope of rock which rises from 

 behind them to a height of 150 feet above ordnance datum. 

 They are packed into the angle between the platform and the 

 cliff, and form a terrace of varying width. 



The succession and relation of the deposits to one another 

 are shown in the following diagram^ : — 



Fig. I. — Diagram of Section in Courtmacsherry Ba3^ 



5. Upper head. 2. Blown sand. 



4. Boulder-clay. i. Raised-beach gravel and 



3. Ivower head. blocks. 



The rock-platform is cut across the edges of the highly 

 inclined black slates and sandstones of the Carboniferous 

 Slate series. It is raised about 5 feet above high-water mark 

 of ordinary spring tides. 



"" A more complete account of this beach has recently been published 

 by the writers. Scz. Froc. R. Dnhl. Soc, vol. x., 1904., pp. 250-324, pis. 

 xxiii-xxxi. 



'^Reproduced b}'^ permission of the Royal Dublin Society. 



