372 The American Geologist. June, 1895 
in age. Up to the present time however, no attempt has been 
made to discuss the remains from different localities separately. 
First Pehiod. 
The older Auriferous gravels, or those of Browne's first pe- 
riod, have furnished nearly all the plant-remains that have been 
studied. Thus the leaves from the gravels at Chalk bluff's* 
studied by Lesquereux, belong to the older gravels, as does 
also the collection from Independence Hill, made by Dr. Cooper 
Curtice, and now in the U. S. National Museum. 
The following localities, where the older gravels are well 
exposed, have not thus far furnislied many fossil plants, but 
should be carefully examined: Gibsonville, Howland Flat, 
Poverty Hill, Scales, and Brandy City, in Sierra county; 
Laporte and vicinity in Plumas county ; near Placerville in 
Eldorado county; the channel south of Oleta in Amador 
county; and the Chili Gulch channel in Calaveras county. 
The fossil leaves from these older gravels were thought by 
Lesquereux to indicate a Pliocene age, but later investigations 
by Ward and Knowlton indicate that the age may be Miocene. 
Prof. Knowlton says: f "There can be no doubt but that 
the plants from Ellensburg (Washington) are similar in age 
to the Auriferous gravels and the John Day valley. The John 
Day valley deposit has always been called Miocene. The 
Auriferous gravels, on the other hand, were regarded by Les- 
quereux and others as Pliocene, but a recent examination of 
that flora based on extensive collections from Independence 
Hill, Placer county, California, seems to indicate that they 
also are probably upper Miocene in age." 
The following is a list of the plants determined by Prof, 
Knowlton from the Ellensburg locality : 
Salix varians Go])p. 
Fopuhta ghindulifera Ht'or. 
Populus russelli, sp. nov. 
Alnm&\). ': 
Ulmus calif ornicu Lx. 
Ulmus pseudo-fulra Lx. 
Plo.tanits dissecta Lx. 
Platanus aceroides ? (Gopp.) Hfcr. 
Paliurun colombi Heer. 
Maynolid Innceolata L.v. 
*Mcmoirs Mus. Comp. ZooL. vol. vi, partii. 
fBull. 108, U. S. Geological Survey, p. 104. 
