112 



WHITEAVES ON CRETACEOUS AMMONITES 



Part of the Dunvegan Sandstones of the Peace and Smoky Eiver Section consists of 

 a fresh-Avater or brackish water deposit, corresponding to the Belly River Series of other 

 parts of the North-west Territories of Canada and perhaps to the Bear River " Laramie " 

 of Wyoming. It contains a Corhula, which the writer is unable to distinguish from C. 

 pyriformis. Meek, Corbicula Durkeii, Meek, a species of Goniobasis, etc. 



Athabasca River and Lesser Slave River and Lake Section. 



Laramie Sandstones and Shales. 1,200 feet.+ 



Foxhill Sandstone 50 feet. 



La Biche Shales 900 feet. 



Pelican Sandstone 40 feet. 



Pelican Shale 90 feet. 



Grand Rapids Sandstone 300 feet. 



Clearwater Shale 275 feet. 



Tar Sands 200 feet, 



Devonian Limestone 100 feet.+ 



Laramie. 



Montana. 



(Pierre and Foxhill-) 



Colorado. 



Niobrara and Benton. 



Dakota. 



CRETACEOUS. 



DEVONIAN. 



In this section, the " Foxhill Sandstone " and the upper *700 feet (or thereabout) of 

 the " La Biche Shales " are the representative of the Pierre-Foxhill or Montana Formation, 

 and the lower 200 feet of the " La Biche" Shales of the upper part of the Niobrara-Benton 

 or Colorado Formation. 



The fossils obtained by Mr. McConnell from the Foxhill Sandstone and upper portion 

 of the La Biche Shales at two of the exposures on Lesser Slave Lake and at three on the 

 Athabasca River are all well known and characteristic species of the Pierre-Foxhill or 

 Montana Formation. Those which are recognizable are Plcria Nebrascana, Evans and Shu- 

 mard, Protocardia borealis, nobis, Tancredia Americana, Meek and Hayden, Cinulia concinna 

 and Lunalia concinna of Hall and Meek, Baculites compressus, Say, and B. ovatus, Say, but 

 there are no Ammonites among them. 



At all the other localities in the valleys of the Peace and Athabasca Ri\'ers, the fossils 

 collected by Mr. McConnell are from lower horizons in the Cretaceous than the " Pierre- 

 Foxhills " or Montana Formation, and the greater part, if not the whole of them, are from 

 the Niobrara-Benton or Colorado Formation. Most of the species from these lower beds 

 are new to science, and among them is a fine series of Ammonites, which will form the 

 subject of the present paper. These will be here considered in zoological order, in accord- 



