Klamath MoiDifahis, California. — Hcrshcy. 239 
Sacramento valley for a long distance, probably several hun- 
dred miles. Southward from a line drawn through Weaver- 
ville, the course is southeast, in conformity with the strike of 
the stratified rocks of the Sierra Nevada region. Probably the 
western geosyncline is completely buried under the Sacramento 
valley and the western limb of the other trough is barely rep- 
resented, if at all, along the extreme western border, of the 
Sierra Nevada region where Calaveras rocks appear west of 
Jurassic strata. 
Northward from a line drawn through Weaverville, the 
strata strike north and finally bend toward the northeast, and 
when the geosynclines pass beyond the Klamath region they 
are striking toward the interior of the continent. 
Superimposed on the geosynclines are structural features 
of the second order such as anticlines, synclines, monoclines 
and faults. These are especially apparent in the western 
trough where the Paleozoic and Mesozoic strata have been 
more or less closely and regularly folded in a manner similar 
to the Appalachian region. The folding of the Paleozoic rocks 
is somewhat difficult to work out because of the uniformity of 
the series, but certain belts of limestone, and in southern Trin- 
ity county, narrow belts of quartzyte, pass up and down the 
slopes of the mountains and are apparently repeated three or 
four times within a half dozen miles in a way to indicate a 
rather close folding of the series. The Mesozoic rocks of 
Trinity county lent themselves to this folding action much 
more readily than did the Paleozoic rocks, and in the Clear 
Creek and Bragdon area south of Hay Fork village, there arc 
at least three synclinal folds occupied by the Bragdon slate, 
separated by anticlines in the axes of which the- Clear Creek 
volcanic series outcrops, all comprised withir a space of two 
miles. These folds are persistent along the 5,trike for twelve 
or fifteen miles. 
In the western Paleozoic area, long narrow belts of the 
Clear Creek volcanic series occur folded down into the slates. 
Four miles below Cecilville, in the valley of the South Fork 
of the Salmon river, there is clear evidence that there has been 
a complete overturn of a limited area so that limestone, slate 
and chert of the Paleozoic series rest upon tuffs of the Clear 
Creek series. The contact is the original one, showing a non- 
conformity, but now upside down. 
