Klamath Mountains^ California. — Hershey. 243 
the north. However, opposed to this idea are the facts that 
close to the border of the serpentine area, the folding is sHght, 
and that the apparent large batholith of serpentine is probably 
a combination of many smaller batholiths so that perhaps only 
a small part of it may have been in fusion at one time and thus 
incapable of exerting much more compressive strain on the 
surrounding rocks than did the granite batholiths. 
The serpentine areas interrupt the continuity of the belts 
of stratified rocks, but do not seriously displace them. From 
the high specific gravity of the peridotyte, it is not likely that 
the disappearance of the strata replaced was brought about by 
sinking, and of fusion in place there is no evidence. Probably 
they were lifted to such a bight that erosion has since removed 
them. 
In denying, in the preceding paragraph, that there is any 
evidence in the Klamath region of fusion, by the heat of the 
intruded magmas, of those portions of the stratified rocks 
which once occupied the position now held by that portion of 
the intrusives which is above the stream-level of the region, I 
do not wish to convey the impression that th^^re is no evidence 
of fusion and absorption of the same sedimentary series at 
greater depth, but simply that erosion has not yet penetrated 
to the zone in which this occurred. 
The injection into the comparatively pliable sedimentary 
strata of material yielding such rigid masses of rock as granite, 
gabbro and peridotyte would be expected to have a marked 
effect on a subsequent system of folding of the region. No 
such effect is apparent in the southern portion of the Klamath 
region, and I conclude that the folding was virtually completed 
before the intrusion of these batholiths. The granite almost 
invariably rises as vertical columns. Following the intrusion 
of the granite there were systems of dikes injected into the 
rocks. The majority of these dikes approximate very closely 
to the vertical. It is impossible to say what deformation may 
have affected the large serpentine areas, but the small serpen- 
tine dikes which are very plentiful in the Paleozoic area west 
of the central schist belt, remain vertical. Had all these bath- 
oliths and dikes been involved in the folding of the sediment- 
ary rocks, they should be inclined at various angles, not a 
few being conspicuously near the horizontal. 
