Shasta County, California. — Fairbanks^ 25 
the earth's origin, that there is no real necessity for assuming 
or believing that the internal temperature of the earth is high, 
but that instead it is most probably low. 
NOTES ON SOME LOCALITIES OF MESOZOIC AND 
PALEOZOIC IN SHASTA COUNTY, 
CALIFORNIA. 
By Harold W. Fairbanks, Berkeley, Cal. 
Tri trod action. In the summer of 1891 the writer, while at 
work on the geology of Shasta county, was fortunate enough 
to make the discovery of several very rich fossiliferous locali- 
ties which appeared to represent horizons previously unknown 
in that part of the state.* Some time later the extensive pa- 
leontological material was placed in the hands of J. P. Smith 
of the Leland Stanford University, who is at present at 
work on it in connection with a more detailed study in the 
field. The field notes are largelj- those of the writer, but he 
is indebted wholly to Mr. Smith for the determinations of the 
various horizons described. 
Genera! geology. Shasta county occupies the greater por- 
tion of the Klamath Mountain region which drains into the 
Sacramento river. The lava flows of northeastern California 
have covered the eastern half of the county, reaching nearly 
to the Sacramento river on the south, while in the northwest 
corner a small flow descended the valley of the same stream 
for a number of miles. That portion of the county to the 
north and west of Pitt river as far as Big Bend is wholly free 
from the lavas, and it is in this region that the richest fossil- 
iferous heels occur. The mountain ranges have a north and 
south trend and rise from two to three thousand feet above 
the valleys, being very rocky but not precipitous. Although 
there is some timber the greater portion of the surface is cov- 
ered with dense brush, making it difficult to traverse excepl 
over the old trails. 
""The reporl on the geology of Shasta county containing a description 
of these discoveries would have been issued by the California State Min- 
ing Bureau in the winter <>f 1892 '■>, but owing in the refusal of the Gov- 
ernor to have the whole printed it was cm down ami much of the geo- 
Logicai porl ion left oul . 
