1916.] 



THE PLEISTOCENE PERIOD. 



347 



This evidence, however, would not fix their order, hence it has 

 to be used in conjunction with that of the beaches. 



The platforms of the 25-feet level are directly associated 

 with the beach and are common to all the islands, to the 

 English and French coasts. All I need do here is to state 

 that they are best seen along the East coast from St. Martin's 

 Point to Fermain Bay. I give three photos, Nos. 



3, and 



/. 



Platforms belonging to the 25-feet level have the peculiar- 

 ity of being very flat ; as far as my observations go, they do 

 not slope upwards at all. 



It is probable that the battery at Fermain Bay has been 

 placed upon a platform eroded by the 25-ft. beach, but I have 

 not been able to confirm this. The reasons for this belief are 

 as follows : — The retaining wall is built against a portion of 

 elevated rock. This is evident from the way the slip between 

 the walls has been cut down and graded from the solid rock. 

 There would have been no object in cutting the rock down to 

 make an entrance into the bay had lower levels existed ; the 

 battery platform is just at the same level as the Divette one, 

 and there seems every probability of the builders having 

 secured a rock foundation for both battery and tower. 



The 50-feet beach on the other hand is not alway flat. 

 It is at Hougue Noirmont and at the Capelles, but its position 

 around the island is more marked by sloping ground. (See 

 Diagram No. 1.) The lower slopes of the East cliffs may 

 also be due to this sea-level. (See Photo No. 8.) 



Diagram No. I. 



2ffoot/>ezch 



^Nt'OFpRSJiSffr ' S£A l£ZFL . 



The eroded platform of the 50ft. beach, Castel. 



At an elevation of 125 feet, Jersey shows a deposit on 

 South Hill, for which I find no counterpart in Guernsey. 

 This is considered to be a beach of tertiary times by all the 

 members of the Jersey Society. I therefore leave it out of 

 the discussion. 



In this connection I may say that Professor Prestwich 

 describes a beach at an elevation of 130 feet, which he places 

 in the same period as the lower beaches. ( See " Raised 

 Beaches," Transactions, Geo. Soc, Feb. 10, 1892, p. 272.) 



