226 RAISED BEACHES, CLIFF AND RUBBLE HEADS. 



At L'Islet* many proofs exist of an old beach quite 

 distinct from that produced by the water margin as it existed 

 100 years ago, and agreeing in level (26*53) with the rock 

 platform beaches of the east coast. 



We now approach a very rich part of the island. .. Ronce- 

 val * Hill has beach surrounding it practically and at a 

 comparatively high level. The patches are chiefly found in 

 the exposed quarry cuttings, and vary in elevation between 

 40 and 50 feet. Opposite this hill and further inland is 

 the noted Capelles beach, which has a mean elevation of 

 54 feet. 



At Noirmont, also well inland, the lanes have been cut 

 down through the beach which here has an average elevation 

 of 55 feet. 



Further out towards the sea is a small pocket at Rocque 

 Maingy at the high level of 68-36.* 



All along the coast from Port Grat to Pezerie the low 

 level beach is picked up at intervals. These patches are too 

 numerous to be mentioned, and are undoubtedly all associated 

 with the platform period. These deposits are well marked at 

 Port Grat, Port Infer, Port Soif, Grande Rocque, Cobo (near 

 hotel), Albecq, Houmet, Grande Mare, La Crocq, Richmond, 

 Perrelle, Dom Hue, Lihou and Pezerie.* 



At Perrelle, however, Mr. Carey has picked up several 

 patches at a higher level, two in a quarry on the coast, and 

 one in a field at Les Rouvets. The latter has an elevation of 

 75 feet. 



These beaches are thus general around the coast, and 

 they naturally, as far as they have been levelled, arrange 

 themselves into two levels, the one a low one, average 25*59 

 feet; the other a high one, averaging 57'74 feet. Excluding 

 several intermediate levels for reasons to be stated directly, we 

 may say that the lower level ranges between 20 and 30 feet, 

 and the upper one between 40 and 50 feet. 



I have excluded two levels from these because, though 

 the rolled pebbles were well en evidence, they existed, not as 

 a beach, but as a " head." I therefore consider them to have 

 been derived from the upper level beach and to result in part 

 from its weathering. 



It is to be noticed that the levels of the lower beach run 

 remarkably near to each other. This beach is in many places 

 only a foot in thickness, and in no case is it many feet thick. 

 Probably it would average, if measured, about 2 feet in thick- 

 ness. 



* See page 124, Geological Report for 1891. 



