582 RALPH W. 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 eet 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 
Fic. 2.—Quercus pseudo-lyrata. 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 
sufficient 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 1, Pinus 1, Picea 1, Smilax 1, Cyperacites 2, 
Populus 3, Salix 3, Hicoria 2, Juglans 1, Alnus 1, Carpinus 1, 
Corylus 1, Castanea 1, Quercus 12, Ulmus 2, Planera 2, Magnolia 1, 
pene 
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