HELL CREEK BEDS, CERATOPS BEDS AND EQUIVALENTS 1 97 



agree with the Fox Hills beds of the Hell Creek section, and should 

 probably be referred to the lower member of the Fort Union as 

 exposed in this region. The absence of invertebrates and presence 

 of plants in a measure supports this view. On this point Leonard 

 says: 



The line of contact between the Pierre and the overlying dinosaur- 

 bearing beds, while not discordant so far as structure is concerned, 

 may possibly represent a time break in which most of the upper 

 fresh- and brackish-water beds of the Cretaceous are wanting. 



Overlying the last mentioned beds is a very conspicuous white, 

 massive sandstone 35 to 50 feet in thickness, which first appears at 

 the north end of Eagle Bluff, 2 miles west of Glendive, and persists 

 for many miles up Sand Creek. The upper surface is somewhat 

 uneven, suggesting the possibility of an unconformity, though this 

 may be only local and of little importance. In the middle of this 

 white sandstone, at a point about 5 miles up Cedar Creek, Dr. A. 

 C. Peale collected fragmentary plants, among them Populus cuneata 

 Newb., while in the upper portion at Eagle Bluff the following forms 

 were obtained: 



Ginkgo adiantoides (linger) Heer. 

 Quercus sp. 

 Lauraceous leaf. 

 Ficus trinervis Kn. 

 Fictis or Sapindus sp. 

 Viburnum whymperi Hear. 

 Viburmim n. sp. 



Other localities for plants in the Glendive area are as follows: 



Bluff east of Sand Creek, 6 miles above Glendive, Montana, 420 feet above 

 the Pierre. 



Taxodium sp. 



Ginkgo adiantoides (Unger) Heer. 



Salix angusla Al. Br. 



Quercus breweri Lesq. 



Populus cuneata Newh. 



Mouth of Cedar Creek, iif miles above Glendive, Montana, 400 feet above 

 Pierre. 



Glyptostrobus europceus (Brongn.) Heer. 

 Sequoia sp. 



