304 ASSINNIBOINE AND SASKATCHEWAN EXPEDITION. 



types of fossils, and a considerable thickness of rocks, in 

 which we find great numbers of upper coal measure 

 forms. We have preferred to give the section in this 

 form, because, in the first place, the upper coal measures 

 of this region pass by such imperceptible gradations into 

 the Permian above, that it is very difficult to determine, 

 with our present information, at what particular horizon 

 we should draw the line between them, while on the 

 other hand it is equally difficult to define the limits be- 

 tween the Permian and beds above, in which we found no 

 fossils." * 



Jurassic or Triassic formations may occur above the 

 Permian in the section just referred to. Messrs. Meek 

 and Hayden state that " between No. 5 (of the Section) 

 and the Cretaceous above, there is still a rather extensive 

 series of beds in which we found no organic remains ; 

 these may be Jurassic or Triassic or both, though as we 

 have elsewhere suggested, we rather incline to the opinion 

 that they may prove to belong to the former, "f 



Formation No. 1 of the Nebraska Series of the Creta- 

 ceous rocks has not yet been recognized in Eupert's Land. 

 This formation reposes on Jurassic rocks in Nebraska 

 territory at the Black Hills. J It rests, as before stated, 

 upon the limestones of the coal measures on the Mis- 

 souri, near the 42 nd parallel. 



" There is at the base of the Cretaceous system, at 

 distantly separated localities in Nebraska, Kansas, Ar- 

 kansas, Texas, New Mexico, Alabama, and New Jersey, 

 if not indeed everywhere in North America where that 

 system is well developed, (at any rate east of the Eocky 



* Page 19, Geological Explorations in Kansas, 

 t Page 21, ibid. 



X On the Lower Cretaceous Beds of Kansas and Nebraska, by F. B. Meek 

 and F. V. Hayden. — Proceedings Acad. Nat. Sci. Phil., Dec. 1858, 

 published in Am. Jour. Sci. page 219, 1859. 



