50 RESOURCES OF CALIFORNIA. 
hard, 2; gray sand, 4; blue clay, 14; light-dtab clay, 3; very 
fine gray sand, 24 (807); light-drab clay, 15 light-gray sand, 
very fine, 27; dark-gray clay, 17; light-blue clay, very hard, 
22; light clay, 11; dark, chocolate-colored clay, very hard, 10; 
light clay, very hard, 15 (910); fine gray sand—a good stream 
of water, 2; clay and sand, 11. (Norz.—A large stream of 
water was obtained in this stratum, rising seven feet above 
the surface.) Fine sand and gravel, 10; blue clay, 20; sand 
and gravel, 6; blue clay, 27; clay, gravel, and mica, 14 (1,000) ; 
in sand, 2. 
The depth of the well is 1,002 feet. The temperature of the 
water, as it issues from the well-surface, is 77°, the atmosphere 
being 60° Fahrenheit. The water rises eleven feet above the 
surface of the plain, and nine feet above the established grade 
of the city. The quantity of water discharged is about sixty 
thousand gallons in twenty-four hours. 
The diluvium in the coast valleys bears a strong general re- 
semblance, in its material and stratification, to that of the San 
Joaquin valley. In many places where artesian wells have 
been sunk, fossil wood and bone have been found three hun- 
dred and four hundred feet below the surface of the ground, 
and two hundred feet or more below the present level of the 
sea. In the mountains there are also large bodies of diluvium, 
but the material is’ coarser than in the valleys, being usually a 
gravelly clay, deposited in distinctly-marked layers, with inter- 
vening strata of sand and boulders. 
§ 36. Gold—Gold is found in nearly all parts of California, 
but is most abundant on the western slope of the Sierra Ne- 
vada, between two thousand and six thousand feet above the 
sea, from latitude 37° to 40°—a district two hundred and 
twenty miles long by forty wide. This may be called the Sac- 
ramento district. It is drained by the Feather, Yuba, Ameri- 
can, Cosumnes, Calaveras, Stanislaus, and Tuolumne rivers. 
The next district in importance is in the northwestern corner 
of the state, including that part of the Sacramento Basin west 
of Shasta, and the lower portion of the Klamath valley. Next 
