Bragdon Foniuition in X. Jl\ California. — Ilcrshcy. 351 
of wliicli iIkto wore anj^ular frai^mcnts oi the cherty slates. 
The latter were reddened I y baking for a short distance 
beneath the lava. At the top of the volcanic series an entirely 
diiTerent relation was observed. The non-chcrty Bragdon 
shales rest on the volcanic material without the least evidence 
of intrusion. The e()ntai:t is straight except for the folding 
of the rocks. Diabasic dikes rise in the volcanic material but 
do not penetrate into the overlying shales. The contact here 
just as sharply sei:)arates formations containing abundant 
greenstone material from a formation from which it is totallv 
absent .as in the Trinity Mountain country. Certainlv the rela- 
tion between the Paleozoic rocks, the volcanic series and the 
overlying shales is the same as that of the eastern area. 
Farther north along the main western belt there is not such 
sharj) folding but rather a simple synclinal structure, so that 
the ])ragdon formation generally outcrops as a single rather 
broad belt bounded on either side by a narrow belt of the vol- 
canic series. On approaching a Bragdon area one invariably 
finds it bordered, except where the dip indicates that the boun- 
dary of the shales is a fault, by a strip of igneous rock in which 
occur tuffs. Igneous material is very abundant in the Paleo- 
zoic rocks of the neighborhood, but I have never observed any 
tuft beds in the series west of the Sacramento river. There is a 
single horizon in that region in which occur surface volcanic 
materials, and whenever I encounter it, I expect to see the 
Bragdon formation next and am generally not disappointed. 
An extended section of the Klamath region traversed by 
the lower 'J'rinity and lower Klamath rivers appears to have 
suffered an unusual amount of dynamical metamorphism. The 
schistose slates of the Paleozoic formations have been convert- 
.ed into distinct micaceous schists. These differ from the more 
ancient schists of the Abrams formation in that the bedding 
planes are totally destroyed and the texture is finer. The 
Abrams formation was crystallized by thermo-metamorphism 
and these P'aleozoic schists were altered by shearing. They arc 
strongly developed along the trail between Hoopa valley and 
Weitchpec at the mouth of Trinity river as well as up the 
Klamath river to the mouth of Bluflf creek. 
The Mesozoic rocks of that region have also been shcared. 
The volcanic material has been altered to a rock closelv rescmb- 
