Calif ornian Metamorphic Fonnations. — Hershey. 241 
is unavoidable that the schists are a distinct series, as a whole 
much more highly metamorphosed than the Devono-Carbonif- 
erous, and that at least to the extent that their alteration ex- 
ceeds that of the other series, the metamorphism is not due to 
the intrusion of peridotyte. 
In the Coast Range region the serpentine areas are com- 
monly bounded by narrow zones of contact metamorphism, the 
product of which is in places a schist as thoroughly crystallized 
as any part of these Klamath schists. These metamorphic 
zones are nowhere of great extent and cannot be used as an 
argument in support of the hypothesis that to the intrusion of 
the peridotyte is due the high degree of metamorphism of the 
Abrams and Salmon formations which are developed over hun- 
dreds of square miles without an outcrop of serpentine. More- 
over, serpentine areas five to ten miles in width adjoin the Clear 
Creek greenstone and the Bragdon slates, as in the Hay Fork 
section of Trinity county, without the presence of a prominent 
schist belt if, indeed, there is any contact thermo-metamorphism 
apparent at all. 
It has been suggested that the schists represent contact 
metamorphic zones due to the intrusion of a granitic batholith. 
Where these batholiths rise through the hornblende schist as 
near the head of the south fork of Salmon river, there is often 
a narrow belt of schist next to the granite. However, this is 
always merely a portion of the Abrams formation normally un- 
derlying the hornblende schist and thrust up along the granite 
contact as the presence of the graphitic layer proves. Large 
batholiths of granite, quartz-mica-dioryte and intermediate 
types occur in the areas of the Devono-Carboniferous and of 
the Bragdon slates and in no case are they surrounded by schist 
zones such as the Abrams and Salmon formations. In fact, the 
only sort of contact metamorphism that I have observed in the 
Klamath region about the granitic batholiths is that the schists 
and slates near the border have often been contorted by the pres- 
sure of the intruded magma, and impregnated with sulphide of 
iron and in general their metamorphism somewhat intensified 
but not materially changed in character. 
Another suggestion is that the metamorphism of the rocks 
of the Klamath region is due to the action of a great magma of 
fluid granitic material underlying the whole territor\- and deep- 
