38 The Ottawa Naturalist. [May 



of Cretaceous age, and in describing them Mr. McConnell gives 



a section as follows : 



La-Biche Shales, upper 700 Montana. 



La-Biche Shales, lower 225' 



Pelican Sandstone 4° 



Pelican Shales 9°\ Colorado. 



Grand Rapids Sandstone 300 



Chearvvater Shales 275 J 



' ' Tar Sands " 220 Dakota. " 



The upper parts of the La Biche shales are thus correlated 

 with the Montana terrane, which corresponds to what is usually 

 known as the Fox Hills and Pierre formations in most of the 

 reports of the Geological Survey ot Canada. The lower portion 

 of the La Biche shales, the Pelican sandstone and shales, the 

 Grand Rapids sandstone and the Clearwater shales, were corre- 

 lated with the Colorado (^Niobrara and Benton) lerranes, while 

 the " Tar Sands,'' in which no fossils were tound, were provision- 

 ally classed with the Dakota. 



The observations which it was possible for the writer to 

 make were chiefly confined to the examination of a few horizons 

 in this section and to the collection of fossils at occasional locali- 

 ties, and while they do not add anything to the accuracy of the 

 section in itself, they may add something to our knowledge of 

 the correlation of the beds with those along the Manitoba es- 

 carpment in western Manitoba, and they besides indicate the 

 existence in this rather remote northern region of a Dakota 

 fauna of distinctly marine type. 



For the provisional generic or specific determination of the 

 fossils, thanks are due to Mr. J. F. Whiteaves, Palaeontologist 

 to the Geological Survey, but since many of the species, though 

 determinable, are as yet undescribed, letters of the alphabet 

 have been added to them to designate them more exactly, where 

 it is necessary to speak of their range through different beds. 



Sixteen miles below the mouth of La Biche river the 

 Cretaceous shales contain, along with crystals of selenite, many 

 rounded calcareous grains, apparently foraminifera, associated 

 with Ostrcea congesta, Baculites ovaUis and fragments of a small 

 gasteropod and of a large aviculoid. They also contain bands 

 of nodules of limestone, many of which are mottled like the 



