136 E E. Clements 



for the Bridge Creek of the John Day region (1925), which is 

 in much the same longitude, the hardwood climax might well 

 be referred to the same period, the Upper Oligocene. But the 

 desert region lies several hundred miles south of the regular 

 storm track, and hence should have been distincdy drier as well 

 as somewhat warmer than central Oregon. This suggests the 

 Lower Oligocene or Upper Eocene as the more probable time, 

 an assumption that draws support from the similar composition 

 of the much earlier hardwood forests of the Dakota Cretaceous, 

 as well as the later Fort Union, in which occur practically all the 

 generic dominants of the modern deciduous climax. 



