458 THE JOURNAL OF GEOLOGY. 
CRETACEOUS. 
Transgresston._—1t has been pointed out by Mr. J. S. Diller* 
that in the region of northern California and southern Oregon, 
during the deposition of the Cretaceous strata, a gradual sub- 
sidence of the land carried the eastern shore-line inland. In Cal- 
ifornia this transgression of the sea was toward the northeast, 
while in southern Oregon it was generally toward the southeast. 
The facts observed in that portion of Rogue River Valley under _ 
discussion may conform to this rule in the main, but being in the 
more immediate neighborhood of the Siskiyous, they may indi- 
cate, also, a subsequent elevation of this range relative to the 
Cascades. The strata consist of heavy beds of conglomerates, 
shales, and sandstones which generally dip toward the northeast 
at an angle varying from 10° to 30°. 
The fauna of the Cretaceous at Riddles, Douglas county, 
Oregon, which is about sixty miles to the northwest, shows a 
much lower horizon for those beds than is indicated by any fos- 
sils yet found in this valley. Deposition was therefore going on 
at Riddles before the Rogue River Valley was submerged. 
STRATIGRAPHY OF THE CRETACEOUS. 
As the strata generally dip toward the north, away from the 
granites of the Siskiyous, as: shown by the accompanying sec- 
tions, the lower and older strata appear along the western flank 
of the valley. However, for the most part the strata are des- 
titute of fossils. This remark applies to the upper beds which 
occupy the eastern side of the valley, but which, from their lithol- 
ogy, dip, etc., are known to be conformable and continuous with 
the fossiliferous beds to the west. They are probably equivalent 
to the barren Chico beds of northern California. Thus far fossils 
have been found only along the western side of the valley; 
though along this side, from the summit where the railway 
crosses, northwestwardly to Jacksonville, fossils are rather abun- 
dant. Three localities, besides the two mentioned by Gabb, have 
furnished fossils of a varied and interesting character. 
t Bull. Geol. Soc. Am., V., 452. 
