328 ASSINNIBOINE AND SASKATCHEWAN EXPEDITION. 



At the second, or most westerly of the Two Creeks the 

 shales are exposed, and the following section occurs : — 



Twenty feet of drift, containing fragments of the under- 

 lying shales and water- worn boulders of gneiss, &c. 



Six feet of ash-grey shales, containing a stratum five 

 inches thick of a pale-green unctuous steatitic substance. 



The steatitic stratum has the following composi- 

 tion * : — ■ 



Si0 3 50-83 



A1 2 0 3 14-45 



CaO ...... 1-23 



MgO 2-33 



FeO . . . . . . ... 6-35 



KO ....... 0-42 



HO 24-36 



99-97 



On the Qu'appelle Eiver this rock is again seen below 

 the Big Cut-arm Creek, and near the Scissors Creek, also 

 at White Sand Eiver near Fort Pelly, and on Birdstail 

 Creek east of the Assinniboine. Although no distinc- 

 tive organic forms were procured, yet the lithological 

 aspect of the rock is the same as on the Little Souris. 

 This remark applies also to the outcrop on the Eiding 

 Mountain. 



An exposure, a few miles below the mouth of the 

 " Eiver that Turns " on the South Branch of the Saskat- 

 chewan, contains at its base a hard calcareous sandstone, 

 containing Avicula linguceformis ; below it is a soft 

 sandstone destitute of fossils. It is not improbable that 

 the strata above the second concretionary layer pass into 

 Formation 5 of the Nebraska section, and represent the 

 upper Cretaceous series in this region. 



Formation No. 4, as developed on the Little Souris 



* This analysis was kindly furnished me by H. H. Croft, D.C.L., 

 Professor of Chemistry in University College, Toronto. 



