Page 250 - 1915, Springs of CA.

232 SPRINGS OF CALIFORNIA.

On the hillside 200 to 500 yards southward, there are four other
carbonated springs which have been developed only to the extent of
excavating small basins about them.
The main springs issue in an area of granitic rock; the minor ones,
on the hillside to the southeast, issue from schists that are a result of
contact metamorphism between the granitic rock and slates. A mile
southward the slopes are covered with andesitic lava, and Tinker
Knob, 3 miles to the east, is a volcanic mountain.1
Near the road, 2 miles westward, downstream from the Summit
springs, there are considerable deposits of lime carbonate, and small
quantities of 'carbonated water still seep from a few points. North
of the railroad, on the wagon road to Truckee, there are also carbon-
ate deposits that are the work of mineral springs.
FLORENCE SPRING (PLACER 6).
A quarter of a mile northeast of Summit Soda Springs, on the
northern side of the stream, there is a carbonated spring that is locally
called Florence Spring. It has a considerably larger flow than the
springs of the Summit group and is not so strongly carbonated, but
it tastes of iron and deposits much iron along its overflow channel.
The spring has not been improved, but it has been used to some
extent for drinking.
HEATH SODA SPRINGS (PLACER 4).
Carbonated springs, known as Heath Soda Springs, issue on the
north side of the canyon of North Fork of American River, 5 miles
in a direct line west of Summit Soda Springs. They yield con-
siderably more water than the Summit Springs but are not so strongly
carbonated. They have not been improved, and as the place is not
easily accessible it is rarely visited. The springs issue in an area of
granitic rock, within a quarter of a mile of the western border of an
area of altered slates. Andesitic lava covers the slopes 2 miles north-
ward and westward.

CARBONATED SPRING NEAR SERENO CREEK (PLACER 3).
About 3$ miles south of Soda Springs station, a short distance east
of the road, is a small carbonated spring that forms a drinking pool.
It is on the eastern side of the canyon of Sereno Creek, near the base
of steep slopes of andesite overlying rhyolitic lava.
DEER PARK SPRINGS (PLACER 7).
In the canyon of Bear Creek, 8 miles in a direct line southeast of
Summit Soda Springs, four small springs form drinking pools of cool,
mildly carbonated water that deposits considerable iron. They were
!A detailed description of the geology of this region is given by Waldemar Lindgren, U. S. Geol. Sur-
vey Geol. Atlas, Truckee folio (No. 39), p. 5,1897.