206 



HISTORICAL PALEONTOLOGY. 



marls. The American Trias is chiefly remarkable for having 

 yielded the remains of a small Marsupial (Dromatherium), and 

 numerous footprints, which have generally been referred to 

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

 tiles (Otozoum, 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 : 



GENERALISED SECTION OF THE TRIASSIC ROCKS OF 

 CENTRAL EUROPE. 



w . 



*< 



Q 



Fig. 139- 



v. 



I Upper Keuper (Kossen or 



[> j Rhaetic beds, and Dach- 



f stein beds). 



1 I I 







V>lVVll VVVV 



II . H II . .. " 



' " " II ., II H " 



I' . " I' ". " 



JUl 



0000 



(/ o O w -O 



Middle Keuper (Hallstadt 

 or St Cassian beds). 



( Lower Keuper (Keuper 

 Sandstones proper). 



Muschelkalk. 



Bunter Sandstein. (Gutten- 

 stein and Werfen beds?) 



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



