650 NORTH AMERICAN INDEX FOSSILS. 



Ladinic, represented by the upper Pit formation and a 

 part of the overlaying Trachyceras homfrayi beds of 

 California, the Trachyceras homfrayi and Daonella beds 

 of Nevada, and the Trachyceras beds of British Co- 

 lumbia. 



DINARIC. 



Anisic, represented by the lower Pit shales of California 

 and the Pelecypod beds of the Aspen Ridge, Idaho. 



Hydaspic, represented by the upper Ceratite limestone of 

 California. 



SCYTHIC. 



Jakutic, represented by unfossiHferous shales in Cali- 

 fornia and Nevada and by the Columbites beds of 

 Idaho. 

 Brahmanic, represented by the Meekoceras beds of Cali- 

 fornia and the Aspen Ridge, Idaho. 



Over most of North America the Triassic is chiefly represented 

 by continental deposits. In the Grand Canyon region the Shina^ 

 rump and the Leroux or Petrified Forest beds constitute the lower 

 Triassic, said to be in part marine. The Vermillion cliff or 

 Painted Desert beds, constitute the upper. In the Yellowstone 

 region the Teton formation and in central Colorado and Utah, the 

 Dolores beds represent a part of the continental Triassic. In 

 some cases, the relationship of these to the underlying Permic is an 

 unconformable one, while in others it is disconformable. In the 

 Front Range region and the Black Hills and Big Horns, the Trias- 

 sic Red beds are variously known as the Spearfish, Chugwater or 

 Upper Wyoming beds. 



In the Texas-New Mexico region, the Dockum gray-brown and 

 red beds represent the Triassic. 



The only Triassic of eastern North America is the Newark 

 formation of Nova Scotia, the Connecticut valley, New Jersey and 

 Pennsylvania to Virginia and the Carolinas. This consists of red 

 sandstones and shales with volcanoes in the northern, and coal beds 

 in the southern regions. 



