QUATERNARY PERIOD. 203 



CHRONOLOGICAL TABLE OF THE QUATERNARY PERIOD. 



SWITZERLAND. 



5. Postglacial deposit of rolled 

 pebbles. 



( \ ravel-beds in the Canton of Basle 

 with Mammoth (?). 



COUNTRIES FOREIGN TO 

 SWITZERLAND. 



Tuff of Cannstatt. 



Gravel-beds of the Somme, with 

 Mammoth arid stone implements. 



Rolled-pebble beds of Mimdesley ; 

 bone-caves, Iloxne. 



Appearance of man. 



England still united with the conti- 

 nent. Retreat of the glaciers. 



America : period of Mastodon ohio- 

 ticum and Mammoth. 



4. Second ylacial epoch. 



Erratic blocks. Moraines. 



Heaps of debris at Aubonne and 



Morges, with Mammoth. 

 Alpine flora in the plain. 



Loess-formation of the basin of the 

 Rhine, with Mammoth. 



Second continental period of Eng- 

 land. Glaciers on the mountains 

 of Scotland. 



Scandinavia elevated. Dispersion 

 of erratic blocks. 



3. Interglacial deposit of rolled 

 pebbles. 



Stratified drift at Utznach and Diirn- 

 ten: Stratliugen on the Lake of 

 Thiin. 



First appearance of Elephas primige- 

 nius (?). 



British Islands chiefly under the 

 sea. Dispersion of northern er- 

 ratics. 



Scandinavia in great part submerged. 

 Formation of the Osars. 



North America in part submerged. 

 Laureutian formation of Desor. 



2. Lignite formation. 



Lignites of Utznach, Diirnten, Wet- 

 zikon, Morschweil, Anuecy. 



Elephas antiquus and Rhinoceros 

 etruscHS, Fal. 



Flora of the plain predominant. 



Calcareous tuff near Marseilles, with 



the Elephas antiquus. 

 Buried forests of Norfolk. 

 Beds of Mytilus at Spitzbergen (?) 



1. First glacial formation. 



Striated stones and erratics below 



the lignites of Wetzikon. 

 Lower deposit of Thouon. 

 Arctic Alpine flora in the plains. 



First British continental period. 



Scotland covered with glaciers. 

 Period of the polishing of Scandina- 



navian rocks. Scandinavia, land 



covered with glaciers. 

 America : smoothing of the rocks. 



Pliocene. 



Norwich Crag of England. 



