KNOWLTON.] 



GEOLOGICAL CONSIDEEATIONS. 



103 



enjoying a distribution beyond the limits of the John Day Basin. 

 Their distribution is shown in the following table: 



Table showing the extralimittd (listrilmtion of the fossil plants from the Cherry Creek 



locality. 



A study of this table brings out the fact that only four of the eleven 

 species have been found above the Fort Union beds. Of these four, 

 Quercus furcinerms mnericana is doubtfully reported from the sup- 

 posed Miocene of Plumas County, California, and Magnolia lanceolata 

 is doubtfully identified in the Cherry Creek beds. Ficus temdnei'vis 

 was described originally from the Green River beds of Wyoming, and 

 Magnolia Culveri from the Lamar beds of the Yellowstone National 

 Park. The remainder have been found in the Laramie, Denver, Fort 

 Union, and the Eocene in general. 



Of the species previously known but not found outside the Cherry 

 Creek beds, Mhammis Cleburni var. is closely allied to R. Gleburni 

 of the Denver beds, and Cornus ferox is allied to an Eocene species. 



From these considerations it appears that the plants of the Cherry 

 Creek locality point to the lower Eocene age of the beds. 



UPPER CLARNO BEDS. 



BRIDGE CREEK. 



The flora of Bridge Creek comprises 45 forms, as follows: 



Sequoia Heerii Lesq. 

 Sequoia Langsdorfii ( Brgt. ) Heer. 

 Monocotyledonous plant. 

 Juglans Schimperi? Lesq. 

 .Tuglans acuminata? Al. Br. 

 Juglans cryptata n. sp. 



Juglans, nut of. 



Hicoria? sp. 



Carpinus betuloides Unger. 



Corylus MacQuarrii (Forbes) Heer. 



Betula heteromorpha n. sp. 



Betula heterodonta Newb. 



