Ts2 F. M. ANDERSON 
of andesitic lava that could hardly have come from any other 
source. But one of the strongest evidences of disconnected 
basins during the later Cretaceous is found ina comparative study 
of the Chico faunas of southern Oregon and the Sacramento 
valley. The dissimilarity of these basins has been partially 
brought out by the writer in a former paper on the ‘‘Cretaceous 
Deposits of the Pacific Coast.”’* 
The Cretaceous basin of southern Oregon represented in the 
deposits of Rogue River valley extended therefore southward to 
the foot of Mount Shasta and eastward, as shown by fossiliferous 
deposits, into the basin of the Klamath Lakes, and was perhaps 
bounded along the north, at least in part, by the older mountains 
of the Rogue River range. This basin connected with the ocean 
along the present course of Rogue River valley. In the basin of 
the Trinity River the later Cretaceous deposits occur, but whether 
the outlet of the basin was toward the Sacramento, or westward 
toward the ocean, has not yet been determined. But the Creta- 
ceous deposits (probably the Chico) have a considerable distri- 
bution along the different tributaries of the Trinity, and the 
outlet may have been in both directions. Chico deposits have © 
been found as far west as the Hay Fork valley, or even on some 
of the tributaries of the South Fork at an altitude that might 
easily connect them with the Pacific. Eighteen miles southwest 
of Hay Fork these deposits occur at an elevation of three thousand 
feet above sea level. 
The Eocene period left no deposits in the Klamath Moun- 
tains, as restricted, that have yet been recognized, nor have they 
been discovered anywhere in the region between the Marysville 
Buttes and the valley of the Umpqua River. Throughout these 
basins, wherever the Neocene deposits occur, they rest nearly 
conformably on the Chico, or on the older basement rocks. The 
conformity of these beds upon the Chico is so marked that it is 
often difficult to distinguish them. 
The Neocene deposits — The Neocene deposits of these basins 
consist very largely of non-marine sediments, often plant bear- 
t Proc. Cal, Acad. Sct., 3d ser., Vol. I1. 
