Page 304 - 1915, Springs of CA.

284 SPEINGS OF CALIFOBNIA.
perature of 86°, issues from another adit or cut in the lake sandstone.
In a small drainage ravine 150 or 200 yards farther northward p.
small sulphureted spring emerges at the base of tuffaceous agglom-
erate that borders the valley at this point. Near it a cooler spring
that is not noticeably mineralized rises in a ditch that discharges
perhaps 5 gallons a minute. The largest spring is 50 yards farther
up the ravine, where approximately 75 gallons a minute of non-
mineral water 62° in temperature rises in a small box-curbed pool
and is piped to the house. The northernmost spring rises from t,
small fissure in the lake sediments and yields perhaps 15 gallons e,
minute of water 85° in temperature. It is mildly sulphureted and
is distinctly mineralized, probably mainly with sodium salts. Ir.
1890 Turner 1 noted a uniform temperature of 75° in the springs but
mentions the reported increase of temperature of other thermal
springs in the region at the time of a slight earthquake. He con-
siders the consolidation of the lake sediments to a sandstone near
the springs to be due to the cementing action of their waters. The
water from the several warm springs is collected in a ditch that runs
below them and is used for irrigation.
In the meadowland half a mile west of the sulphur springs there
is a marshy area 20 yards in diameter. A keg that has been sunk
near its margin affords a drinking pool containing distinctly sul-
phureted water that had an observed temperature of 48° (in Sep-
tember). The sulphur contents of this spring and of the warm
springs seem to be derived from the lake sediments through which
they rise.

SULPHUR SPRINGS NEAR SOUTH FORK OF YUBA RIVER (PLACER'2).
In the canyon of South Fork of Yuba River, less than a mile north
of Cisco railroad station, are two small springs, one of which forms
a drinking spring near the wagon road on the southern, side of the
river. The other is some distance farther upstream, on the northern
side of the river, and has been little used. Their waters are only
faintly sulphureted. The rocks of the locality consist of slates, in
part altered by contact metamorphism,2 that are of Jurassic and
Triassic age.

SULPHUR SPRING ON BEAR RIVER (NEVADA 1).
A sulphur spring that is similar to the springs near Cisco rises
on the northwest bank of Bear River, a quarter of a mile below the
wagon bridge 3 miles north of Colfax. The spring rises below flood-
water mark, at the base of a bowlder of gabbro, which is the country

1 Op. cit.,p. 396. '
2 Lindgren, Waldemar, U. S. Geol. Survey Geol. Atlas, Colfax folio (No. 66), 1900.