Gray] 612 [Worked Flints. 



PLATE t. 



FIG. I. — RATSED BEACH GRAVELS, LARNE. 



The raised beach gravels constitute deposits of marine origin 

 laid down during certain variation of coast line levels that took 

 place at the close of the Tertiary period. 



The gravels occur at Carrie kfergus and Kilroot at one side, 

 and at Holywood, Cultra, and Ballyholme at the other side of 

 Belfast Harbour. 



They are very well represented at Carnlough ; the Curran 

 or Corran of Larne is made up of such raised beach gravels. 

 All the above gravels contain worked flints, of various forms, 

 showing that man occupied the locality during the deposition 

 of the gravels. 



The section at Larne demonstrates that the period of accumu- 

 lation was of long duration and of remote antiquity. Our 

 plate shows the beds A, B, and C resting upon the tilted-up 

 edges of a series of beds marked D. Worked flints have been 

 found in all the beds, forming a face of about 20 feet deep. — 

 See B.N.F.C. Report for 1889-90, />. 198. 



FIG. 2. SAND-DUNES, BANNMOUTH. 



Sand-dunes are accumulations of sand, chiefly collected on 

 the sea shore, at or near the mouth of rivers. Such collections 

 are not permanent, being of eolian origin, and subject to 

 constant alteration by the wind. The effect of the wind pro- 

 duces deep basin-like hollows between the undulating heaps of 

 sand, and on exposed sections the old surfaces are indicated by 

 bands of carbonised vegetable matter. 



The hollows between the sand-heaps formed capital shelter- 

 places, and were used as such by primitive man, who established 

 settlements on the sand-dunes, from which he went forth to 

 hunt and fish. Here he manufactured his implements and 

 weapons of flint, and here he left the refuse of his workshop and 

 his dwellings in such abundance and variety as to furnish a very 

 fair indication of his habits and mode of life. Sand-dunes of 

 the kind occur at each side of the Bann mouth, also at Portrush, 

 in Co. Antrim, and Dundrum, in Co. Down. The illustration 

 shows the bands of old surfaces, and in the hollow of the basin 

 the gravel in which the worked flints are usually found, 



