386 THE DEPOSITS. - 



That both of these deposits and all intermediate sands, &c, 

 should have been eroded away from the old raised beaches 

 (excepting a few deposits as at Miellette, see section, Dia- 

 gram No. 13) is a strange fact, but there remains enough 

 hardened clay in crevices to show that they were deposited. 



At L'Islet there have been found implements resting on 

 the beaches showing that they are there because the clay 

 contained them, and these are of the earliest Palaeolithic 

 type. (See Museum exhibits.) 



That the upper clay was laid down over the 50 ft. beach 

 is demonstrated by the Miellette section, as stated above, but 

 that deposit was not eroded off the top of the beach. (See 

 Diagrams 12 and 13.) 



To sum up : we have now before us the evidence of the 

 " Head"; of the ice-worn rocks and of the glacial clays; all 

 pointing to two separate glacial ice-caps and submergences. 

 When I began the study of the superficial deposits, some 

 thirty years ago, I saw plainly the glacial conditions and the 

 submergence I did not expect to find them duplicated, and I 

 was very slow to admit the fact, and therefore, can hardly 

 blame the Society for the unwillingness to admit even the one. 

 The idea of the island being altogether outside the area of 

 glacial action being so strongly established had become fixed. 

 The discussions which took place over the deposits of the 

 Vrangue Brickfield show how slow we were in reading the 

 evidences so plainly set before our eyes. 



Up to now we, therefore, have it established that we show 

 evidences of three separate submergences, two glacial periods 

 and intermediate periods of sea erosion. 



Those of our members who have read the excellent report 

 of Dr. R. R. Marett on the " Head" on the islet of La Motte 

 in Jersey will, I think, see a possible explanation of the facts 

 which puzzled Sir J. Prestwich, and be able to trace the 

 period of dry frost as the agent in the formation of the layer 

 of large detached stones found at the base of the " Head " 

 and their altered positions. 



That the clays are of marine origin we are daily receiving 

 confirmation from the observations and deductions of the 

 geologists now working over the South of England, where a 

 short time ago no glacial depression was formulated. French 

 authors are also giving detail which gives to glacial times 

 depressions of the land far exceeding the extent believed 

 possible only a short time ago. 



To refer to one paper, " The Gravels of East Anglia," 

 by T. McKenny Hughes, M.A.^ F.R.S. In this monograph 



