818 Ihe American Geologist. May, 1393 
Mr. Fairbanks also found several localities».of fossils in these 
mountains, but does not state what the fossils are. 
Mr. Diller in the article above referred to, and Mr. Stanton, 
in a paper in the same bulletin, also soon to be published, produce 
evidence of the unconformity of the Cretaceous series of the 
Coast ranges, from the Knoxville beds to the Chico beds inclus- 
ive, on the Triassic and Carboniferous rocks of the Klamath moun- 
tains, and find evidence also of continuous sedimentation in 
northwestern California in the Cretaceous series as shown by the 
fossils. 
If, therefore, the metamorphic rocks of the Coast ranges can 
be shown to be of the same age as the metamorphic rocks of the 
Klamath mountains, then the entire series must be pre-Creta- 
ceous in age. No positive evidence on this head seems yet to have 
been produced. The two sets of rocks are very different litho- 
logically, the rocks of the Klamath mountains having been 
brought into their present metamorphic condition chiefly by 
dvnamo-metamorphic alterations, while the metamorphism of the 
Coast Range series is more a chemical one, characterized particu- 
larly by silicification, although dynamo-metamorphism also played 
an important part. 
From the following extract from the Geology of California, vol. 
I, J. D. Whitney, p. 363, it would appear that the line of de- 
markation between the two sets of rocks is quite sharp: "At 
and north of Crescent City, a plain stretches along the ocean for 
about twenty miles, having a width of six or seven miles in 
places. The metamorphic slates make their appearance along 
the beach, as is well seen about four miles to the east of the 
town, where the sea washes the base of the hills. These slates 
continue south to the mouth of the Klamath river where as we 
are told there is an entire change in the character of the forma- 
tion, the metamorphic rocks of the Coast ranges coming down to 
the sea at this point and extending along the shore far to the 
south. The auriferous slates crop out in reefs and on the main 
land near Crescent Cit}', forming the promontor}' near which 
the town is built, and they extend north for a mile or more where 
they disappear under a covering of Tertiary sandstone." 
Mr. Diller also informs me that in going west over the Kla- 
math mountains he noted in the vicinity of Mad river a marked 
change in the lithologic character of the rocks, those to the east 
