Page 85 - 1915, Springs of CA.

HOT SPRINGS. 81
tide and is of little importance. Pyritiferous rock that borders the
coast here possibly furnishes the sulphur constituent of the water,
and the oxidation of the pyrite may account for the abnormal tem-
perature of the spring.
SKAGGS HOT SPRINGS (SONOMA 8).
Along the southwestern bank of a tributary of Warm Spring Creek
in northern Sonoma County three hot springs issue in a distance
of 75 yards. At this locality is one of the oldest resorts of the State,
opened to the public in 1857. The region is composed of old sedi-
mentary rocks, and the springs rise from crevices in buff-colored
material that is probably sandstone, though its appearance is tuffa-
ceous. Eastward along the road to Geyserville, a few schistose
ledges, serpentine belts, and a little opalized. rock, all of which are
probably of the Franciscan formation, were noted. The sediments
are crushed and slickensided at many places and show that the
rocks have been much disturbed. Such crushing, which was possi-
bly accompanied by some faulting, may account for the escape
of hot water at Skaggs Springs and at other places in these disturbed
sediments. The water at Skaggs is not perceptibly sulphureted, but
it has a distinct oily pdor and taste.

Analyses of water from \main spring, Skaggs Hot Springs, Sonoma County, Cal.
[Constituents are in parts per million.]

1 2
54° C. (129° F.).
Properties of reaction:
5 4
0 0
0 0
81 84
14 12
119 9
By Reacting By Reacting
Constituents.
weight. values. weight. values.
879 38.22 898 39.05
Potassium (K) .................................. .............. 9.8 .25 3.8 .096
Trace. Trace. .19 .028
3.0 .04 2.9 .042
Trace. Trace. .25 .006
Calcium (Ca) .................................................. 26 1.30 15 .75
61 5.03 55 4.51
Iron (Fe). ...................................... .............. 5.0 .18 .45 .016
Trace. Trace. .04 .004
Sulphate (SO4). ................................. .............. 26 .54 2.4 .050
Chloride (Cl) ................... j .............................. 60 1.68 63 1.77
Iodide (I). ...................................... .............. 1.9 .015 Trace. Trace.
Carbonate (CO{). ............................... ............. 1,157 38.58 1,146 38.19
Metaborate(BOs)..... .......................... .............. 176 4.10 193 4.49
Silica (SiOg) .................................... . 151 5.01 120 3.98
2,555.7 2, 500. 03
1,057 48.00
1. Analyst and authority, Winslow Anderson, 1888.
2. Analyst, E. W. Hilgard. Authority, U. S. Geol. Survey Bull. 32.
35657° WSP 338 15 6