1916.] THE PLEISTOCENE PEKIOD. 357 



I do not formulate an arrest for the sea, for it is connected up 

 by 60 feet to 70 feet both in Jersey and in England. 



We nOAV have to consider the evidence of a further rise 

 of sea-level. I admit that the higher levels, between 75 feet 

 and 300 feet, are not well marked in Guernsey [the cave at 

 Les Tielles is a doubtful evidence of sea level but it may 

 be a sea-cave (see Photo No. 17)] but they exist in the 

 South of England, and as Professor Prestwich believed 

 them to belong to the same period, the evidence of a continued 

 rise is, I think, to be admitted. When we arrive above 

 200 feet, the evidence depends entirely on the acceptance of 

 the pebbles in the clay, as proving that a beach was laid down 

 at about 300 feet. 



I think that there are two points that must be well consi- 

 dered and given their due weight. These are the fact that in 

 Guernsey, in Jersey and in England (South), the clays yield 

 numbers of these beach pebbles which must have been derived 

 from a beach, and also that that beach was distributed before 

 its constituent pebbles had time to be cemented into a 

 conglomerate. 



All these different levels have left marks ; not only those 

 described but inland cliffs or escarpments. What weight we 

 can give these is uncertain, for we have not sufficiently 

 studied them. We are not quite sure, for instance, that these 

 steep slopes of St. Saviour's and the upper Hubits in Guernsey 

 and below Don Bridge in Jersey are due to this period. I 

 therefore do not bring them into my argument ; but there are 

 minor deposits at high levels which are most significant ; 

 such beds, for instance, as sea-sand at the top of Route 

 Isabelle and at the top of the Calais valley, and sea gravel at 

 the top of the Hubits valley. These deposits are all above 

 200 feet elevation and one is at 250 feet. 



CHANGE OF CLIMATE INDICATED. 

 In the islands no writer has described any marine fauna 

 in the beaches and, as we have seen, Mr. Sinel thinks they 

 have been destroyed ; but in England there have been found 

 shells, such as now exist in the South of Europe, associated 

 with shells now common to our latitude. Prestwich, however, 

 speaks of the latter being stunted, of small size and falling to 

 pieces when touched. Remarking on this statement Dr. Hoist 

 writes as follows : " This I believe to depend on the fact that 

 the water here on the South Coast of England, which had 

 become more and more cold, . . became altogether too cold . . . 

 to permit of the molluscan fauna reaching its full de- 

 velopment." 



