KNOWLTON.] THE FLOEA IIST OTHEE LOCALITIES. Ill 



to the Upper Eocene. It may be noted, though the fact is perhaps 

 not of great importance, that the matrix in which the plants of the 

 Payette formation are preserved is similar to that at Bridge Creek. 



In 1900 I published a short paper on the Fossil Plants associated 

 with the Lavas of the Cascade Range, " which accompanied a paper 

 by Mr. J. S. Diller, on The Bohemia Mining Region of Western 

 Oregon, with notes on the Blue River Mining Region and on the 

 Structure and Age of the Cascade Range. It was with the latter por- 

 tion of Mr. Diller's paper that my own had especial connection. This 

 paper was based on small collections that had been made by Mr. Diller 

 and others. Six localities were represented, as follows : (1) Left bank 

 of the Columbia River, near the mouth of Moffats Creek; (2) Com- 

 stock, Douglas County; (3) 1 mile east of Murphys Springs, south- 

 east of Ashland; (-1) Coal Creek, Lane County; (5) 5 miles directly 

 north of Ashland; and (6) 3 miles southeast of Ashland. The entire 

 flora comprised only 28 forms, of which 10 were described as new to 

 science and 7 were not named specifically, leaving but 11 species with 

 previously known distribution. No localit}^ was represented by more 

 than 10 forms and most of them hy from 2 to 5 forms. 



The species composing this flora were compared with those from the 

 John Day Basin and the Auriferous gravels of California, and were 

 referred to the Miocene. In the light of our present knowledge of 

 the type section in the John Day Basin, certain modifications of this 

 reference seem necessary. I hesitate, however, to make radical 

 changes in my former determination without additional material. 

 When taken as a unit this flora is undoubtedly similar to that of the 

 John Day Basin, considered as a whole, but when an attempt is 

 made to relegate the species from individual localities to one of the 

 three horizons now recognized in the basin, the meagerness of the 

 material becomes very apparent. With the exception of the first of the 

 localities to be mentioned, the following tentative classification may be 

 made: The locality on the Columbia River near the mouth of Moffats 

 Creek contains Ace7' Bendlrei and a doubtful leaf of Popuhis Zaddachi. 

 The first of these species is so characteristic that I have little or no 

 hesitation in referring it to the same age as the Van Horn's ranch 

 material, namely. Upper Miocene. The localities 5 miles north of Ash- 

 land and 3 miles southeast of Ashland seem to be more closely allied to 

 Bridge Creek and are probably to be regarded as Upper Eocene in age. 

 Murphys Springs is also probably the same in age as Bridge Creek, 

 while Coal Creek, in Lane County, and Comstock, in Douglas County, 

 seem likely to be older Eocene than the Bridge Creek beds. But I 

 wish to emphasize the fact that these are purely tentative views, and 

 we must depend upon fuller collections to settle the points at issue. 



a Twentieth Ann Rcpt., U. S. Geol. Survey, Pt. Ill, pp. 37-64, pis. 1-5. 



