THE TRIASSIC PERIOD. 



211 



tains, where the beds consist of sandstones and gypsiferous 

 marls. The American Trias is chiefly remarkable for having 

 yielded the remains of small Marsupial (Dromatherium} , and 

 numerous footprints, which have generally been referred to 

 Birds (Brontozoum), along with the tracks of undoubted Rep- 

 tiles (Otosoum, Anisopus, &c.) 



The subjoined section (fig. 139) expresses, in a diagram- 

 matic manner, the general sequence of the Triassic rocks when 

 fully developed, as, for example, in the Bavarian Alps: 



GENERALIZED SECTION OF THE TRIASSIC ROCKS OF 



CENTRAL EUROPE. 



Fig. 139- 



Upper Keuper (Kos- 

 sen or Rhsetic beds, 

 and Dachsteln beds). 



'- \ n 



i i T T 



JLJLJLji 



rnr-r 



\\' \ 



1... 



Middle Keuper (Hall- 

 stadt or St. Cassian 

 beds). 



j Lower Keuper (Keuper 

 I Sandstones proper). 



Muschelkalk. 



/ Bunter Sandstein. Gut- 

 tenstein and Werfen 

 beds?) 



With regard to the life of the Triassic period, we have to 



