206 



HISTORICAL PALEONTOLOGY. 



marls. The American Trias is chiefly remarkable for having 

 yielded the remains of a small Marsupial {D?vmatJieriicm), and 

 numerous footprints, which have generally been referred to 

 Birds {Bro?itozoum), along with the tracks of undoubted Rep- 

 tiles {ptozoum, AnisopHs, Szc.) 



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. 



Fig. 139- 



H 



« . r 



1 





o 



V^ 



I I I I 



J 1 



i_L 



1 



I I 



II I 



IL II II II .11 II W W H 



It H II II II H il II 11 



II II II I' II n II li IT 



II II II II il II w 



II II I! II II H II ~ [i 



II II II II II II II |i 



<» O 9 « 



000 c> 

 000 



Q <» O W 6 



1 o O IS 



00 a- <> 



O « J> O p C" V 



p a o » <7 9 



A » o s 9 oeo 



o o c -o 



Upper Keuper (Kossen or 

 Rhoetic beds, and Dach- 

 stein beds). 



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 



