206 HISTORICAL PALAEONTOLOGY. 
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 (rontozowm), along with the tracks of undoubted Rep- 
tiles (Otozoum, Anisopus, &c.) 
The subjoined section (fig. 139) expresses, in a diagram- 
matic manner, “he 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. 
} Uppet Keuper (Ko6ssen or 
Rheetic beds, and Dach- 
l stein beds). 
( Middle Keuper (Hallstadt 
or St Cassian beds). 
UPPER TRIAS. 
Lower Keuper (Keuper 
Sandstones proper). 
~ } U_.. |. Bunter Sandstem.s(Giiten- 
stein and Werfen beds ?) 
| 
With regard to the Ze of the Triassic period, we have to 
TRIAS. 
MIDDLE 
LOWER TRIAS. 
