582 RALPH \V. CHANEY 



assumption of a valley uncertain, but in any case the sloping soil 

 line establishes the fact that this old land surface had considerable 

 relief at the time 3 was deposited on it. 



The age of the Eagle Creek formation has been imperfectly 

 known, due to the small amount of fossil material previously 

 secured from it. On the basis of these more extensive collections 

 it will be possible to fix the age with reasonable certainty. At 

 present the age may be referred tentatively to Upper Eocene on 



Fig. 2. — Qucrcus pseudo-lyrala. One-half natural size 



the basis of close resemblances of the flora to that of the Upper 

 Clarno beds of the John Day Basin and related formations in Idaho 

 and California. 



THE ECOLOGICAL COMPOSITION OF THE FLORA 



It is not the purpose of this paper to describe the composition 

 of the Eagle Creek flora from the taxonomic standpoint. It will be 

 sufflcient to note that of some 80 species represented, 75 are 

 angiosperms, of which but 2 are monocotyledons. Following is 

 a provisional list of the genera, with the number of species included 

 in each: Ginkgo i, Pinus i, Picea i, Smilax i, Cyperacites 2, 

 Populus 3, Salix 3, Hicoria 2, Juglans i, Alnus i, Carpinus i, 

 Corylus i, Castanca i, Qiiercus 12, Ulmus 2, Planer a 2, Magnolia i, 



