Shasta County, California. — Fairbanks. 29 
ber of places below the limestone as far up the river as 
Campbell's. The shales outcrop most prominently on the west 
side of the river just above Baird P. 0. Here they are very 
highly metamorphosed in places by dikes of diabase and dia- 
base porphyrite. Four miles above, two specimens of trilo- 
bites were obtained from a dark calcareous shale. They were 
submitted to captain A. W. Vogdes, U. S. A., who stated that 
they were quite similar to Proetns ellipticus from the Lower 
Carboniferous of the middle states. 
The limestone peaks along the east side of the McCloud ex- 
tend in a north and south direction, but the strike of the strata 
is about north 30 degrees west. The repetition of the lime- 
stone bodies in the north and south direction, as well as that 
of the fossiliferous beds along the river, is undoubtedly due 
to sharp folding or faulting. If this were not so the thick- 
ness of the limestone would be immense. The McCloud lime- 
stones are considered by Mr. Smith as belonging to the Upper 
Carboniferous. The fauna consists chiefly of corals and 
brachiopods. Perhaps the best preserved specimens are to be 
obtained from the oldest known locality south of Pitt river. 
Fossils are however quite abundant in many places as far up 
the river as Campbell's. These limestone beds lie akyig an 
axis of great disturbance for at least twenty-five miles. At 
the southern extremity this disturbance seems to have been 
greatest, for in the vicinity of Basses ranch, south of the main 
limestone range, small areas of the rock appear separated from 
each other some distance, and inclosed in a variety of erup- 
tive rocks. At the fisheries and many other points up the 
river, the limestone has been intruded by a great number of 
fine grained dikes. These seem to have come up underneath 
and to have very much broken the lower portion. In some 
places radial arms of limestone extend down from the main 
portion of that rock toward the river and are partly or wholly 
inclosed in eruptive masses. On stratigraphical grounds the 
writer would correlate the McCloud limestone with that found 
by Mr. Diller on Soda creek in the extreme northern part of 
the county. The McCloud limestones cross the river about 
sixteen miles above its mouth and are known to occur at sev 
eral points in the high range east of the Sacramento river. 
The McCloud limestone is generally associated with rocks 
