Page 72 - 1915, Springs of CA.

68 SPRINGS OF CALIFORNIA.
phureted water rises at about six places in this locality, for a distance
of 150 yards, in the bed of the creek and along its sides. Bathing
pools have been excavated and the place is frequently visited by
campers, who find good camp grounds a few hundred yards below the
springs. As at the Montecito springs, the country rock is sandstone,
which here dips about 30° E.
A fault which has been traced through the valley of vSanta Ynez
River passes a few miles north of these springs. Local fracturing
in connection with this extensive movement possibly has taken place
near the San Marcos springs and has afforded escape to deep-seated
water.
LAS CRTTCES HOT SPRINGS (SANTA BARBARA 1).
Las Cruces Hot Springs issue on a hillside about 18 miles west of
San Marcos Hot Springs and 4 miles northward from Gaviota rail-
road station on the coast. Four warm springs here furnish about
50 gallons a minute of mildly sulphureted water and in two of the
springs inflammable gas rises. A ledge of calcareous material back
of the largest springs probably has been formed by deposition from
the water. In 1908 there was a bathhouse at the largest spring,
and the place was occasionally visited by campers.
The topographic position of the springs is worthy of note, as they
are in a little swale on the mountain side one-half mile from and 400
feet above the main drainage canyon of this region. Thick-bedded
sandstone here dips about 30° SW. and strikes nearly in the direc-
tion of steepest slope.

NEWSOMS ARROYO GRANDE WARM SPRING (SAN LT7IS OBISPO 9).
Newsoms Arroyo Grande Warm Spring is situated in a small open
canyon 2£ miles east of the town of Arroyo Grande, in San Luis
Obispo County. The spring yields about 15 gallons a minute and
rises in a board-curbed pool that supplies tub baths and a small
swimming plunge. The temperature of the water is 98°. The water
tastes moderately sulphureted, and a small amount of sulphur is
deposited along the run-off channel. A small amount of acid salt
also forms on the curbing of the spring, and when these salts are
placed in the water, which is clear, a black precipitate that is prob-
ably iron sulphide immediately forms. The constituents render the
water unsuitable for laundry uses, but they are not objectionable for
bathing. The following is an analysis of the water: