172 THE STORY OF THE EARTH. 



species now living in or about the New Zealand 

 seas. 



The Bracklesham beds have generally been re- 

 garded as represented by the Calcaire grossier of 

 the Paris basin, while the Barton clay corresponds 

 to the grits with the Nummulitcs variolarius y and 

 some newer deposits, such as the (ires de Beau- 

 champ. These beds are well represented in Bel- 

 li. The Bracklesham beds have yielded some 

 interesting serpents of the genus PahcopJiis though 

 not so large as those of the London clay. In the 

 Barton clay occurs a marine mammal, of the genus 

 SSeuglodan shown by its back bone to be a true 

 whale, which has the teeth double-rooted and ser- 

 rated in a way that is seen in no other animal, 

 though resembling some seals. 



The Barton period comes to an end with a 

 deposition of 200 feet of sand, in which fossils 

 are rare. 



Theoretically! the Bracklesham and Barton 



- together are an immense expansion of the 

 middle 50 feet of the Bagshot sands at Aldershot, 

 which contain, in some of the clayey layers, im- 

 \ fossils which appear to be identical 

 with those found at barton m Hampshire, and 

 Bracklesham in Sussex. On this hypothesis the 

 sham and Barton beds indicate in the 

 Hampshire area a depression of the old sea-bed, 

 into which peculiar faunas successively moved. 



I - Bagshot Or barton sands bring back 



n the conditions of a shoal, or shore, due 



,d uprising u f the land. The tew 

 i:< h have been found 111 them arc barton 



i-bed continued to be elevated until 



1 into a land surface, in the succeeding 



