240 



DOUGLASS FOSSIL MAMMALIA. 



Explanation of Map. 



The map shows only approximately the Tertiary arena, as their limits have not been mapped or accurately 

 defined. I have personally observed the Tertiary deposits in all the regions in which they are indicated, except in 

 the small areas in the Yellowstone valley. 



Where there is doubt as to the subdivisions the general term Tertiary has been used. By Oligocene, While 

 River or John Day is meant. In the small spot marked Eocene (?), near Lima, fossils were found, but they appear 

 so contradictory that it was thought best, not to publish descriptions of the (ossils until the beds were 

 reexamined and a solution of the problem found. 



Places marked W? L? etc., indicate Unit the beds are doubtfully While River, Loup Fork, etc. 



