STRATIGRAPHIC SUMMARY. 649 



These rest unconformably on the Union and Riverdale and Norton 

 beds, of Mississippic age. 



The Little River Group of New Brunswick is regarded by 

 Canadian geologists as Devonic, but palaeobotanists on the strength 

 of the fossil plants refer it to the Carbonic, approximately the 

 Kanawha. Here it is also placed by Handlirsch, who regards the 

 insects as Carbonic, though Scudder described them as Devonic. 



Coal-measure beds also occur in Sydney, Cape Breton (AUe- 

 ghanian) and in Rhode Island (Bristol, Cranston, East Providence, 

 Pawtucket). Coal measure conglomerates also occur (Newport or 

 Naragansett Basin conglomerates). Coal measures likewise occur 

 in Massachusetts (Worcester coal beds, Roxhury conglomerate, 

 etc.). 



B. THE MESOZOIC SYSTEMS. 



Vni. The Triassic System. 



The Triassic system is represented by marine strata only in 

 Pacific North America, the known deposits occurring in California, 

 Oregon, Nevada, Idaho and British Columbia. The European sub- 

 division is adopted, for it equally well fits the West American 

 deposits. The following are the latest published American corre- 

 lations :*^ 



BAJUVARIC. 



Rhaetic, represented by the Foreman plant beds of 

 California. 



NoRic, represented by the upper Hosselkus limestone and 

 the Pseudomonotis beds and Juvavites beds of Cali- 

 fornia, and the Pseudomonotis beds of Nevada and 

 British Columbia. 



TIROLIC. 



Karnic, represented by the lower Hosselkus limestone 

 and the Halobia beds of California; the Star Peak 

 limestone of Nevada, and a part of the Trachyceras 

 beds of British Columbia. 



*' Hyatt and Smith, Professional paper 40, U. S. Geol. Survey — Introduction. 



