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 (Dromatlicrium), 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- 



C Upper Keuper (Kos- 

 < sen or Rhsetic beds, 

 ( and Dachsteln beds). 



Middle Keuper (Hall- 

 stadt or St. Cassian 

 beds). 



Lower Keuper (Keuper 

 Sandstones proper). 



Muschelkalk. 



Bunter Sandstein. Gut- 

 ten stein and Werfen 

 beds?) 



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



