Page 287 - 1915, Springs of CA.

SULPHUR SPEINGS. 267
Bark shales that dip steeply eastward are well exposed in the
ravines and canyons of the lower slopes of this region.1 Near both
the Colyear and Hensley springs, however, the rocks are altered, and
schists were observed associated with siliceous sediments veined with
quartz. Serpentine is exposed for most of the distance between the
localities of the two springs and apparently forms a dike that trends
west of north across the slopes.

SULPHUB SPRING ON SOUTH FORK OF COTTONWOOD CREEK
(TEHAMA 8).
There is a sulphur spring in the canyon of South Fork of Cotton-
wood Creek, about 4 miles west of Toms Head Mountains and 10 miles
in a direct line northwest of Colyear Springs, but it is in a brushy
region, is difficult of access, and has been seldom visited. The rocks
in the vicinity are the sedimentary and metamorphic rocks of the
Coast Ranges, such as were noted at Colyear Springs and Hensley
Spring.

SULPHUB SPRING SOUTHWEST OF FOUTS SPRINGS (COLUSA 2).
A spring about 1 mile by trail south and west of Fouts Springs
(Colusa 3, p. 205), in the upper end of a little glade on the brushy
slopes, forms a small pool, from which there is a flow of about 5
gallons a minute of water that tastes mildly sulphureted and slightly
salty. A deposit of lime carbonate that crusts the surface for sev-
eral yards below the spring indicates that the water also contains
calcium and carbon dioxide in considerable amounts. The spring
has been occasionally visited by guests from Fouts Springs, but it
has not been permanently improved as a drinking spring.

SULPHUB SPBING WEST OF FOUTS SPBINGS (COLUSA 1).

A sulphur spring that is similar in character and mode of occur-
rence to that southwest of Fouts Springs (Colusa 3) issues 'on "Old
Joe's" place, about 1£ miles west of Fouts Springs. It yields perhaps
10 gallons a minute of mildly sulphureted water and was formerly
used in irrigating a garden. During recent years, however, it has
been unused, and as it lies on a steep mountain side it has been
seldom visited-.
The rocks near both of the sulphur springs described in the fore-
going paragraphs consist of the series of altered sediments and asso-
ciated serpentine that is common in this region. The springs
apparently issue from altered sandstone.

1 These deposits have been described by J. S. Diller (Tertiary revolution in the topography of the
Pacific coast: U, S. Geol. Survey Fourteenth Ann. Rept., pt. 2, p. 406,1894).