1914.] GEOLOGICAL RESULTS. 133 



This sand having been disturbed by the Dolmen building 

 must have been in situ in their day. 



You will also recall the fact that at L'Islet the black 

 layer had been eroded by the action of the sea and varied in 

 thickness in different places around the hougues on which the 

 Dolmen stands. 



The black coloured sand was a new deposit to us, and since 

 the discovery of the Dolmen I have been looking for it in other 

 places, one of which was Rousse. The layer which I had 

 noticed was examined by the members, but owing to a want of 

 confidence on my part in the sufficiency of the evidence I said 

 very little of what was in my mind to the assembled members, 

 contenting myself with the statement that for the time being 

 the deposit was not correlated with any of the peat deposits. 



Two members of the Jersey Society were present, and I 

 gathered that they did not know of any deposit in Jersey to 

 match this one. I gradually came to the conclusion, after the 

 excursion, that the deposit was evidently not of the forest age, 

 but was a land surface deposited after the 25-ft. beach. Mr. 

 Sinel, to whose opinion we all attach weight, came to the 

 Island and accompanied me to the spot on the 3rd June, and 

 we discussed the evidence with the deposit before us, with the 

 result that we agreed that the facts were as stated. 



This then constitutes a new discovery, and as far as 

 the Channel Islands are concerned, Guernsey possesses the 

 only deposit of this period. 



I shall now take the deposits of the beach at Rousse in 

 the order in which they occur. 



1. — Beginning at the top we have several inches of grass 

 with a sandy soil (N) in which Neolithic flint drippings are 

 found, one being taken from this deposit on the afternoon of 

 our visit. This I look upon as the Neolithic surface now 

 suffering from present day denudation. 



2. — Next in order is a deposit, or rather several super- 

 imposed deposits of blown sand (A'. A . A"'. A'v.) That 

 these have been deposited at different times or that there 

 have been periods of rest accompanied by denudation is 

 evident by the lines of vegetation and layering. There is a 

 difference in the age of the Rousse deposit of sand as com- 

 pared with the L'Islet one. The latter has been deposited 

 over the Dolmen and is hence postneolithic, but not so at 

 Rousse where the Neolithic finds have, so far, been met with 

 in the grass layer only. The LTslet sand is only a remnant 

 of a larger deposit which has been removed from the sea 

 side of the cliff, 



