362 



HISTORICAL GEOLOGY. 



Carboniferous. 



Jura-Triassic. 

 Laramie. 



( Appalachian. 



J Central. 



1 Western. 



' Michigan. 



( Eastern Virginia. 



"j N " " " 



192,000. 



500 (?). 



North Carolina. 



( Plains and Plateau. j KA nnn /0 . 

 1 Pacific Slope. f 50 ' 000 ( ? >- 



Animals Reptiles. A large number of the most 

 extraordinary reptiles yet discovered (Fig. 324), and also 

 several species of small marsupial mammals, are found in 

 these uppermost Cretaceous beds. 



Fi. 3^4. Triceratops prorsue, x H V (After Marsh.) 



