I So THE STORY OF THE EARTH. 



deer, rhinoceros and Mastodon which were obvi- 

 y derived from a land surface, and perhaps 

 from an older deposit. In this bed are multitudes 

 of fossils from the London clay, and a few croco- 

 diles and PlesiosaufS derived from the older Sec- 

 ondary rocks. 



The characteristic shells of the Coralline Crag, 

 besides the comparatively rare species of Voluta, 

 Cassidaria^ Pyrula and Lingula^ include many spe- 

 cies of the genus A starts. That genus which now 

 characterises northern regions, is here repre- 

 sented by multitudes of individuals. The Cypri- 

 ana i$landica % Terebratula grandis % Cardita senilis, 

 Buecinum daiei are typical fossils. 



The Rod Crag. 



After the Coralline Crag was formed in some 

 tranquil depth of water, the shores appear to have 

 been upheaved. And on the eroded surface about 

 20 feet of false bedded sands and comminuted 

 shells were laid down, as shore deposits, which 

 fringe the island-like masses of white or coralline 

 crag. This newer deposit, named Red Crag t indi- 

 cates three or four successive depositions. Each 

 Of its beds was planed level by denudations, which 



left thin layers of pebbles and nodules of phos* 



phate "f lime at the junctions. 



It has been observed that the older KvA C 

 at Walton on the Naze, has fossils more like the 

 if the Coralline Crag than are found else- 

 where. \: Butley a /one abounds in north* 



this is a newer crag still. The 

 \'r<\ I the river Deben Contains a larger 



niinr estrial mammals than ha 



found at the base of the Coralline C The 



