PASKAPOO FORMATION 371 



Beyond these determinable exposures the sloping banks are grass-covered, 

 and below the forks of the river the underlying Pierre appears. 



Summary of the Eed Deer Eiver Section 

 paskapoo formation 



The Paskapoo beds consist of more or less hard, light gray, or yellow- 

 ish sandstones, usually thick-bedded and sometimes cross-bedded; also 

 of light bluish-gray and olive shales, often interstratified with bands 

 of concretionary blue limestone. It is essentially a sandstone formation. 



The strata are purely of fresh water and eolean origin. 



Near the mountains these beds, according to Tyrrell, appear to rest 

 conformably on the Pierre shales. On the Eed Deer Eiver and else- 

 where they are separated from the underlying brackish-water Edmonton 

 beds by a widely distributed coal seam of varying thickness. No other 

 sign of unconformity has been recognized, but a considerable time elapsed 

 between the close of the Edmonton and the beginning of the Paskapoo — 

 a time interval represented by all or the greater part of the Lance. No 

 dinosaurs are found in these beds, and the abundant and varied dino- 

 saurs of the underlying Edmonton formation are an older facies than 

 those of the Lance. 



Before the sedimentation began the entire group of dinosaurs had 

 become extinct. A mammalian fauna now takes its place. This fauna is 

 more varied than that of the Lance and is comparable to it, according to 

 Dr. Matthew. 



The invertebrates are all fresh-water species. Eocene climatic con- 

 ditions had by this time become well established, as shown by the 

 varied species of plant life. 



VERTEBRATES 



Multituberculata : 



Menisccessus sp. indesc. 

 Ptilodus sp. 

 Cimolodon sp. 



Trituberculata : 



Didelphops sp. "] 



? Batodon sp. I ? Marsupiala 



f Thlwodon sp. 



? Gen. Indesc. "^ 



? Gen. Indesc. L ? Insectivora 



Pantolestidse gen. indet. 



? Creodonta 

 ?Tallgrada 



