1913] TERRACES AND LITTORAL PHENOMENA IN RAUEK 9 



rocky shore-platform, and might imagine it to be of ancient date. 

 But on closer inspection all the evidences tend to prove its recent 

 origin, as the formation of this ledge is really going on at the 

 present day. This phenomenon, too, shows us that the sea-vvaves 

 must have worked at the present shore-line for a considerable 

 time, and thus at the same time furnishes a probable evidence 

 of the fact that large and extensive accumulations of Mya are- 

 nåria Lin. are found in shallow water in numerous places along 

 our present coast-line, while this molluskn has in vain been 

 sought for in the deposits of our raised beaches and ancient 

 terraces. 



