Calif ornian Metamorphic Formations. — Hershcy. 227 
Coffee Creek region, I propose the name of the Abrams post- 
office of that section. It is composed of thin foHa of muscovite 
of dull colors, such as gray, light brown, yellow and dull red, 
separated by irregular layers of white quartz, representing 
the original laminae. Throughout it is very highly siliceous and 
doubtlessly portions of it would by some be called mica- 
ceous quartz schist. In certain belts the silica predominates 
to such an extent as to cause it to outcrop like great veins of 
very glassy, white and dark blue quartz. The relatively great 
amount of this primary quartz is particularly characteristic of 
this formation. There are, also, in places thin folia of hard 
blue crystalline limestone, sometimes thickening and clearing 
to a beautiful white marble. The foliation of the formation is 
parallel to the top and bottom and in general to the original 
lines of stratification. 
This particular schist formation occurs in a long narrow 
belt bounding the great serpentine area of northeastern Trinity 
county on the west. Beginning somewhere in Siskiyon coun- 
ty, west of Callahan, it runs continuously in a southerly direc- 
tion across the valley of Coffee creek, the head of the south 
fork of Salmon river, and thence through the mountains just 
a little west of Weaverville. From here its course is south- 
easterly in conformity with the strike of all formations in 
southern and western Trinity county. The canon of Weaver 
creek is cut principally into it and it is finely exposed along 
Trinity river near Douglas City. From here southward it 
widens out into a belt several miles in width and constitutes 
the mass of Bully Choop mountain, on the southern slope of 
which it sinks beneath the Cretaceous formations of the Sac- 
ramento valley. 
In the southern portion of this schist belt it appears to be 
folded into at least two main anticlines along the axes of which 
serpentine outcrops in the form of narrow belts constituting 
the so-called dikes. I wish particularly to call attention to the 
fact that serpentine is commonly associated with this mica 
schist formation. The normal succession of the strata in the 
direction of the dij) is invariably serpentine, mica schist and 
hornblende schist. 
Another narrow north-south belt of mica schist crosses the 
south fork of Salmon River valley at the village of Cccilville. 
