318 ASSINNIBOINE AND SASKATCHEWAN EXPEDITION. 



CHAP. XL. 



THE CRETACEOUS SERIES. TERTIARY FORMATIONS. 



Distribution of the Cretaceous Series in Western North America. — The 

 Nebraska Section. — Vertical Section in Nebraska and Rupert's Land. — 

 Formation No. 1. — Formation No. 2. — -Formation No. 3. — Formation No. 4. 

 — Great Development of Formation No. 4 in Rupert's Land. — Fossils. — 

 Steatitic Minerals. — Analysis of. — Anomia Flemingi. — Inosceramus Cana- 

 densis. — Leda Hindi. — Scaphites Nodosus. — Clay Iron-stone. — Bands of 

 this Formation. — Distribution of. — Richness of. — Analysis of. — Forma- 

 tion No. 5 of the Nebraska Section. — Its Occurrence on the Flanks of 

 Rocky Mountains. — Fossils of. — Avicula Linguseformis. — Avicula Ne- 



brascana. — Nautilus Dekayi. Tertiary Formations. — Lignite on the 



Riding and Duck Mountains. — Sand Dunes probably derived from Ter- 

 tiary Rocks. — Tertiary Coal. — Lignite Basin of the Missouri. — Lignite on 

 the North Saskatchewan. — On Red Deer River. — On the South Branch. 

 — Lignites of Oregon and British Columbia. 



The Cretaceous Series are more extensively distributed in 

 Eupert's Land, than any other fossiliferous formations. 

 This remark, indeed, is susceptible of extension to the 

 continent of North America, where the extraordinary 

 development of this series may be inferred from the fact, 

 that they have been traced continuously from beyond the 

 North ( Branch gf the Saskatchewan to the Gulf of 

 Mexico, and under the 52nd parallel, nearly across 

 the fossiliferous basin, or over 12° of longitude. Its 

 eastern boundary in Eupert's Land is shown approxi- 

 mately by the Pembina Mountain, and the continuation of 

 that ancient sea coast, to the main Saskatchewan below 



