274 OUR COMMON BRITISH FOSSILS. 



the casts of the Teredo-borings alone were left to tell 

 of the many changes through which re-deposited 

 fossils frequently have to pass before they reach their 

 final resting-place. 



Bracklesham Bay, in Sussex, has long been famous 

 for its remarkable series of Eocene strata, some of 

 them full of shells. At Whitecliff Bay we have 

 deposits of about the same age, in which fossil mol- 

 lusca are abundant. The large and beautiful bivalve 



Fig. 262. Cardita imbricata (Eocene). 



Cardita planicosta gives its name to the stratum where 

 it swarms, in company with the univalve Turitella 

 imbricataria. 



The Barton Clay is a higher deposit than the last 

 mentioned, and it is perhaps the most renowned 

 hunting-ground of the entire Eocene formation. It 

 takes its name from Barton, on the Hampshire coast, 

 and there, and also at Hordwell, the geologist will find 



