Page 305 - 1915, Springs of CA.

SULPHUR SPRINGS. 285

rock at this locality,1 and forms a pool of distinctly sulphureted
water. The spring is known locally, but as it is not near the road
it has been seldom visited.
SULPHUR SPRING ON MIDDLE FORK OF AMERICAN RIVER (PLACER 10).
A small spring of strongly sulphureted water is situated in the
canyon of Middle Fork of American River, about 20 miles west of
Tahoe. The water issues at the base of a bluff of morainal material,
on the southeast side of the stream. It has been visited by fisher-
men and others who penetrate this portion of the Sierra, but it is not
well known.

SULPHUR SPRINGS ON RUBICON RIVER (ELDORADO 1).
On the southern side of the canyon of Rubicon River, below the
mouth of Five Lakes Creek and about 13 miles in a direct line south-
west of Tahoe, there is a spring that yields perhaps 1 gallon a minute
of strongly sulphureted, saline water. Two other similar springs
issue at points about 1 mile and 3 miles farther downstream. An
analysis of water from one of them shows that it contains large
amounts of sodium, calcium, and chloride. As the canyon is rugged
and is not easily accessible, the springs are not well known.
The canyon sides near the springs are of granitic rock, but slate
and quartzite are exposed on the higher slopes, and it seems probable
that the chemical constituents of the water are derived mainly from
these altered sedimentary rocks.
SULPHUR SPRING NEAR AMERICAN RIVER (ELDORADO 5).
Near Kyburz station, which is on the stage road between Placer-
ville and Lake Tahoe and near the junction of the Silver and South
forks of American, River, there is a small, strongly sulphureted spring,
which is known only locally. It is situated in, an area of slates and
granitic rocks that are overlain by lava of relatively recent age, and
the water probably rises in altered slates near the zone of contact
with the granitic material.
STJLPHTJR SPRING ON PA OH A ISLAND (MONO 6).
On, the western shore of Hot Spring Cove on, Paoha Island, in Mono
Lake, opposite the hot springs that have been, previously described
(Mono 7, p. 144), there is a spring of mildly sulphureted water that
has also a slight odor and taste of petroleum. On, account of the
intensely alkaline character of the lake water, this spring has at times
furnished a welcome supply, and during the fall of 1908 it was used
by men, who were drilling for oil on the western border of the island.
It is worthy of note that a slight artesian flow of warm water, which,
like the spring water, tasted mildly of hydrogen, sulphide and of
1 Lindgren, Waldemar, op. cit.