HELL CREEK BEDS, CERATOPS BEDS AND EQUIVALENTS 215 



Taxodium occidentale Newb. 

 Platanus guillelnKC Gopp. 

 Cocculus liaydcnianus Ward. 



Same locality as last but about 300 feet above base of lower Fort Union. 



Taxodium occidentale Newb. 



Populus amblyrhyncJia Ward. 



Popnlus cuneata? Newb. 



Populus genetrix Newb. 



Viburnum perplexum Ward. 

 Same locality as last two, but near top of lower Fort Union. 



Taxodium distichum miocenum Heer. 



Berchemia multinervis Al. Br. 



Celastrus ferrugineus Ward. 



18. POSSIBLE DISTRIBUTION OF LOWER FORT UNION IN OTHER AREAS. 



Having passed in review the areas where the lower member of the 

 Fort Union is known to occur, a brief mention may be made of 

 certain extra-limital areas where the evidence is incomplete or con- 

 flicting, and further data are to be looked for. 



In the central Canadian provinces the Fort Union is known to be 

 present over a wide area, and it is more than probable that it will 

 ultimately be found possible to differentiate the lower and upper 

 members; in fact it is thought that the Edmonton beds of the 

 Canadian geologists may correspond to the lower member and their 

 Paskapoo beds to the upper member. But the writer has seen no 

 material from Canadian sources, and the above reference is tenta- 

 tive. 



From scanty information at hand it seems likely that the lower 

 Fort Union will be found spreading over a considerable area in 

 northern Montana near Big Sandy, along the Missouri River in the 

 Fort Peck Indian Reservation and in southern North Dakota and 

 northern and northwestern South Dakota. 



At Black Buttes, Wyoming, beds containing a Fort Union flora 

 have been found resting with marked unconformity on the so-called 

 ''Black Buttes beds" (the beds containing Agathaumas sylvestris), 

 while 20 miles to the southward they rest on the Lewis shale, this 

 condition continuing to the outliers of the Uintas near the Wyoming- 

 Colorado line. That these beds with a Fort Union flora are the 

 beds described and mapped by King as Vermilion Creek or Wasatch, 



