RAISED BEACHES, CLIFF AND RUBBLE HEADS. 223 



Having enumerated the raised beach deposits of this 

 portion of the coast I shall now describe their surroundings. 



FIGURE 1. 



Rock platform. / Position of raised beach, 



25 feet above mean sea-level. 



Present mean sea-level. 



Diagrammatic Section of Rock Platform, Raised Beach and Cliff Head. 



We find that these beach deposits rest directly on a 

 rough rock platform which extends for some distance beneath 

 the cliff in some places (see Fig. 1.), but in others is fully 

 exposed. This rock platform is roughly 50 to 60 feet wide 

 and extends, very much broken by gulleys and interrupted by 

 jutting points, from Petit Bot to the Vallette. In many 

 places it gives decided evidence of having been ground down 

 to a flat surface by the action of rolling stones and in just 

 such spots exist our best preserved deposits. An exception is 

 found at Bec-du-Nez, for there we have the platform without 

 the beach. We, however, know that the beach did exist and 

 that it has only just lost its very last remnant. Where the 

 platform is well flattened and most marked the beach is found 

 to extend along its top in a thin straight deposit of about 

 1 foot in depth, very much interrupted with the remains of 

 the protruding rocks in some places, still traceable as a line. 

 Where rock gullies and irregular rock masses exist the beach 

 is more usually found in pockets large and small just where 

 the former sea has rolled them in. In such cases the deposits 

 are higher than on the platforms and evidently result from 

 the action of high tides. 



