234 RAISED BEACHES, CLIFF AND RUBBLE HEADS. 



that they occur from 50 feet to 300 feet elevation. From 

 Pleinmont, towards Tortevtil, they are still to be found in 

 various places. I have not examined clays between Torteval 

 and the Forest, but on the St. Martin's side of the Forest I 

 have seen them, though more sparsely distributed than at 

 Pleinmont. Inland I have found them at Les Fauxquets. 

 At the Varclin, Captain Carteret Carey found a few pebbles in 

 the upper clays, and kindly brought them to me. The 

 Society itself yesterday had an opportunity of seeing pebbles 

 at Jerbourg, also in the upper portion of the head. In the 

 two last cases the elevation of the deposits is 300 feet and 

 above. 



I have noticed these facts for the last two years, but have 

 not drawn any conclusions from them, not feeling sure that 

 they were not accidental occurrences. I have, however, 

 satisfied myself that the Pleinmont deposit, which is fairly 

 important, owing to the number of pebbles and the area 

 covered, which is not far short of a square mile, is not acci- 

 dental. Feeling satisfied, I have no hesitation in systematising 

 the deposit. 



I conclude that a deposit of beach stones, the location of 

 which is as yet undetermined (or possibly a number of small 

 deposits) existed on the highest levels of the island before the 

 deposit of the upper portion of cliff-head, and that the pebbles 

 occur in this portion of the head in consequence of the 

 destruction of such deposit or deposits simultaneously with 

 the deposit of the clay in the head. 



THE PROBABLE ORDER OF THE FORMATIONS. 



Inasmuch as the beaches rest on the rocks and are under 

 the " heads," they must have been laid before the " heads." 



The large stones at the base of the " heads " are next in 

 order. 



Their deposit was followed by the lower clay or what we 

 may term stony clay, owing to the large proportion of stones 

 present. This was followed by a re-deposit of rubble of 

 smaller size than the first, and then the fine yellow clay was 

 laid down. Lastly, the earthy clay with fine rubble imme- 

 diately below the soil covering the " head." 



CLAY DEPOSITS. 



The Society is already acquainted with the fact that clay 

 exists in large quantities on the very highest portions of the 

 island, as well as in many lower portions. 



