QUATERNARY DEPOSITS OF BRITISH ISLES BROOKS. 



311 



long period of temperate climate and another long period of arctic 

 climate. 



Returning now to Cromer, we find underlying the arctic and 

 glacial sequence there the Cromer forest bed, which contains a tem- 

 perate fauna including an admixture of Pliocene forms — including 

 Machaerodus^ Rhinoceros etrusciis^ and Elefhas meridlonalis — with 

 Pleistocene forms, including Elephas antiquus and a rare form de- 

 scribed as E. primigenius^ but which according to H. Pohlig (76) 

 really belongs to his s^^ecies E. trogonther'd. This agrees closely 

 with the St. Prestian of France. 



The associated flora has been shown by C. Reid and Dubois (77) 

 to be almost identical with that of the Tegelen clays already de- 

 scribed (see p. 290) as underlying the chief terrace of the Rhine, the 

 terrace which we have already seen to be conternporaneous with the 

 first glaciation of north Germany. The glacial deposits of eastern 

 England may accordingly be correlated as follows: 



EASTERN ENGLAND. 



Cromer forest bed. 

 Arctic fi'esli-water bed. 



North Sea drift and Scandinavian 



drift of Durham. 

 Arctic marine sands of Cromer and 



Yarmouth. 

 Chalivy bowlder clay and Scottish clay 



of Durham. 

 ^Marine sands and gravels of March 



and Holderness. 

 Temperate lacustrine beds of Hoxne. 



Cheviot bowlder claj^ of Durham. 



Hessle bowlder clay. 



Arctic beds of Hoxne. 



Brick earths of Hoxne (Acheulian). 



Temperate peat of Holderness. 



Arctic peat of Holmpton. 



NORTH EnBOPE. 



Clays of Tegelen. 



First glaciation of north Germany and 



Holland. 

 Chief terrace. 



Older interglacial of north Germany 



with CorMcuIa flumhiaUs. 

 Cyrina marine beds of Denmark and 



Holland. 

 Middle terrace of Rhine. 

 Second glaciation of north Germany. 



Second interglacial of North Germany. 



Baltic glaciation of north Germany. 



THAMES VALUEY. 



According to Messrs. Hinton and Kennard (78), the history of the 

 lower Thames can be divided into the following stages : 



1. Plateau gravels formed. 



2. Hill gravels formed ; Chellean implements in places. 



3. Highest terrace of Thames (136 feet at Dartford Heath) Corbicula 



fluminalis. 



4. Elevation of 30 feet and formation of 100-foot terrace. Galley Hill 



man, Elephas, Leo, Hippopotamus. Fauna at Swanscombe includes 

 Microtis intermedius. Reindeer, Elephas antiquus; Acheulian. Mr. 

 Leach, as a result of investigations of a Dartford Heath, suggested 



