WHiTEAVEs] LARAMIE AND CRETACEOUS INTERTEBRATA. 29 



C. FEOil THE 'FOX HILLS" AND " FOET PIEEEE " GEOUPS 

 OF THE UPPEE CEETACEOLS. 



The reasons for not considering the fossils, from these two formations 

 separately are thus given in the following memorandum prepared hy 

 I>r. Dawson. '■ In the district embraced by the geological map of the 

 region in the vicinity of the Bow and Belly Elvers, published in the 

 "Eeport of Progress" of the Canadian Survey for 1S82-S4, it is 

 generally impossible to separate the Fox Hills and Fort Pierre series. 

 In the map referred to, these series are consequently represented by a 

 single colour. In a few places, generally situated in the south-western 

 part of the district, the Fox Hills Group is clearly recognizable in 

 the form of massive beds of sandstones, which on the St. 3Iary's Eiver 

 were observed to be about eighty feet in thickness. In other parts of 

 the region the dark-bluish or coffee-coloured shales of the typical Fort 

 Pierre Group become interbedded with sandstones, lose their dark 

 colour, and pass imperceptibly upwards into the base of the Laramie. 

 This is well seen in the vicinity of Eye-Grass flat, on the Old Man 

 Eiver. The change from marine to fresh water conditions, in these 

 cases, occui-s in this series of transitional beds, and when the fresh 

 water character becomes pronounced, the fossils are found to be 

 characteristically Laramie, to the exclusion of the marine Cretaceous 

 forms of the underlying beds. "When the Fox Hills Group is repre- 

 sented by massive sandstones, fossils of any kind are rarely present. 

 Most of the fossils which form the subject of the present report have 

 been collected in the district above defined, but the remarks above 

 made with regard to the unsatisfactory character of the stratigraphical 

 grounds for the separation of the Fox Hills and Fort Pierre Gi'oups 

 are generally equally applicable to the contiguous districts to the east 

 and north, from which a portion of the fossil moUusca were derived." 



BEACHIOPODA. 



LiNGULA NiTiDA, Meek and Hayden. 



Lingiila nitida, Meek and Hayden. 1861. Proc. Ac. ^'iit. Sc. Phil., vol. XIII., p. 

 443. 



:\Ieek. 1876. Eep. U.S. Geol. Surv. Terr., vol. IX., p. 9, pi. 28, 

 figs. 18a, b. 



Three miles north of Eoss Coulee, near Irvine Station, on the Cana- 

 dian Pacific Eallway T. C. Weston, 1884; abundant: Old Wives Creek, 

 Township 10, Eange 11, west of third Principal Meridian, E. G. McCon- 

 nell, 1884 : one specimen. 



