1912.] 



DISCOVERY OF A. CIST. 



411 



FLINT IMPLEMENTS (see illustration L). 



Many flint flakes were found at various depths in the 

 soil surrounding the cist, but for the most part they were dis- 

 carded flakes chipped off in the manufacture of implements. 

 A few small implements such as scrapers, saws, points and 

 burins, were found both in the interior of the chamber and in 

 the surrounding soil of the enclosures, in the former chiefly in 

 the lower 4inch (10cm.) layer of soil above the layer of yellow 

 clay. 



NOTES ON THE GEOLOGICAL CHANGES WHICH HAVE 

 OCCURRED SINCE THE CONSTRUCTION OF THE 

 STRUCTURE. (By Mr. A. Collenette, F.C.S.) 



1. — The structure in all its detail is placed upon the 

 fairly flat top of a raised beach. 



The raised beach belongs to the series for which the 

 mean elevation above O.D. of 25 feet has been adopted.* It 

 is a beach of large extent and composed of fairly large peb- 

 bles. The pebbles are not cemented, but are very much 

 decomposed, the softer rocks being represented by pebbles 

 which have become disintegrated. 



There evidently has been an absence of cementing mate- 

 rial overlying the beach at this spot, for in other places, 

 underlying head, the beach is found conglomerated. The 

 absence of high land in the immediate neighbourhood con- 

 firms the opinion, so that it is possible and even probable that 

 the beach has never been covered by deposit other than 

 eolian, in which wild plants have grown to such an extent 

 that four feet of black vegetable mould covers the beach at 

 its south and west margins, and everywhere this mould has 

 penetrated the beach itself, so that instead of having a yellow 

 colour, as is found in other places, due to oxidised iron, the 

 stones and gravel of the beach are black. 



2. — The beach appears to be of less depth under the 

 structure than on the west and south sides of the deposit, 

 where there is evidence of a thickness of pebbles of eight 

 feet ; this is owing to the beach material having been driven 

 by storms to the lower levels on the south and west sides. 



When the structure was erected the foundation stones 

 were placed, not on, but in the beach, and the black earth and 

 blackened pebbles disturbed have been found around the 



*The raised beach in question varies in detail just as does the present sea-level- 

 beach, but there is no reason to suppose that the mean level of the L'Islet raised 

 beach is unusual. 



