JURA-TRIAS IN AMERICA. 



459 



On the slopes of the Black Hills and on the South Platte undoubted 

 Jurassic fossils occur, indicating an open sea. In New Mexico New- 

 berry found impressions of- plants, indicating the same horizon as in 



Fig. 733. 



Fig. 732. 



Fig. 735. 



Fig. 736. 



Fig. 737. 



Fig. 739. 



Figs. 732-739.— Plants of the Jura-Trias (after Newberry): 732. Branch of Conifer (Brachyphyl- 

 lum). 733. Branch of Conifer. 734. Conifer, Branch and Fruit. 735. Zamites occidentalis. 

 736. Otozamites Maconibii. 737. Podozamites crassifolia. 733. Tseniopteris elegans. 739. 

 Alethopteris Whitneyi. 



