Page 228 - 1915, Springs of CA.

210 SPRINGS OP CALIPOKNIA.

from the other is almost black from iron sulphide. The latter effect
has, however, possibly been artificially produced by bringing together
the flows of an iron and a sulphur spring.
As most of the springs are sulphureted, the locality might be prop-
erly described with the sulphur springs, but the carbonated springs
are most used for drinking and are probably as characteristic of the
place.
The following analyses show the chemical character of the principal
springs. The Salt-Condiment Spring is characterized chiefly by pri-
mary salinity, but secondary salinity is notable; the Soda Spring is
primary alkaline in character; and the other springs, though differing
widely in concentration and exhibiting many minor differences in
composition, are all of mixed type primary alkalinity, secondary
alkalinity, and primary salinity all being prominent.
All of the springs are of small flow. Only four of them discharge
more than 1 gallon a minute, and each of these four yields less than
5 gallons a minute. The temperatures are above the normal, ranging
from 69° to 87°.
The rocks at Alum Eock Park consist of beds of shale and sand-
stone of Tertiary age that have been highly tilted and folded. These
sediments are probably the direct source of the main constituents
in the spring waters.