1902,1 DOUGLASS — CRETACEOUS AXD LOWER TERTIARY. 221 



relations in time of the formations under consideration concerning 

 which there is doubt : 



Table Shotuing Probable Relations of the Laramie and Overlying 

 Beds in Different Regions. 



Cretaceoics. Tertiary, 



Laramie of King 



In Wyoming ^mmmmmn^mim^mMaimmmm^^^^i^m- 



Laramie Fort Union 



Plains of Montana • 



Laramie Livingston j Fort Union 



Crazy Mts., Montana ^_Bai^_iB_ \ 



Laramie Arapahoe Denver; 

 Denver Basin .i.^__. ■»«».» ; 



Laramie Puerco Torrejon 



Puerco River, N. Mex ' 



The names given are the ones by which the different divisions 

 have been called. There does not seem to be much doubt that the 

 Livingston, Denver, Puerco, etc., are contemporaneous with what 

 in other places has been assigned to the upper portion of the Lara- 

 mie. Whether all will be included in the Laramie later will de- 

 pend on the results of further careful investigation. I have indi- 

 cated the doubtful division between the Cretaceous and Tertiary by 

 a dotted vertical line passing between the Livingston and Fort 

 Union and between the Puerco and Torrejon, or approximately so, 

 not claiming that the time division line between the two sets of 

 strata would fall exactly in the same place. The horizontal parallel 

 lines are intended to represent contemporaneity of deposition. 

 Deposition in the Denver Basin was not continuous and the blank 

 spaces indicate non-deposition. The broken or dotted lines indi- 

 cate probable continuity. 



Remarks on the Fossil Mammals. 



The mammals are represented by about a half dozen species. 

 Five of these are represented by teeth. Almost any one of these 



