242 ilic .imcrican Geologist. April, looi 
ly buried beneath the present surface level but exerting its in- 
fluence high in the overlying strata to a degree which the com- 
paratively small batholithic arms could not. This would imply 
that in any given area, there was a maximum of intensity of al- 
teration in the deepest portion of the strata near the granitic 
mass and the degree of metamorphism decreased upward to- 
ward the surface. The oldest sediments would naturally be 
buried deepest and be the most altered. Afterwards elevation 
and folding would bring the deeper strata to the surface and 
belts of schists would come to outcrop parallel with the belts 
of but slightly altered slates. As applied to the Klamath re- 
gion I have the following objection to make to this hypothesis : 
No fluid granite magma existed under the Klamath region 
until after the Jurassic period of eruption of greenstone. Dur- 
ing the deposition of the Bragdon slates or immediately after, 
such a granitic magma may have formed under the region, and 
when, just at the close of the Jurassic period, the entire terri- 
tory was uplifted, folded, faulted and extensively fractured, 
the strata subsided on this fluid magma and the batholiths and 
acid dikes were formed. Now, did the metamorphism of the 
schists and slates date entirely from this period, there should 
be a gradual transition in the degree of alteration from the old- 
est and lowest to the newest, which certainly is not the case. 
I want to particularly emphasize the facts that the schist 
series is about equally metamorphosed from bottom to top and 
throughout its extent over hundreds of square miles, that then 
occurs a break, so to say, and the Devono-Carboniferous series 
although showing some variation, as a whole is altered to prac- 
tically the same degree, but much less than the schists although 
the two are in contact in places, while then occurs another 
"break" and the Jurassic series although showing little varia- 
tion in metamorphism throughout its extent either vertically or 
horizontally, as a whole is much less altered than the Devono- 
Carboniferous. Taken in connection with the evidence of 
unconformity between the three series the only reasonable ex- 
planation is this : 
After the sediments of the schist series were deposited, they 
uplifted, tilted, to a certain degree nictamorphosed, and then 
eroded. This land was depressed beneath the sea and the De- 
vono-Carboniferous sediments deposited. At the close of the 
