kel.] CALIFORNIA. 119 
Analyses of limestones from Solano and Contra Costa counties, Cal. a 
lica (Si0 2 ) 9.05 
Lumina (A1 2 3 ) 7. 56 
on oxide (Fe,0 3 ) 5 - 20 
me (CaO) | 33. 35 
agnesia (MgO) 1.25 
Ikalies ( K,0, Na 2 0) 2. 05 
lphur trioxide (S0 3 ) 1. 03 
irbon dioxide (CO,) - 28. 56 
ater 2. 05 
2 
:{ 
i 
42.61 
12.89 
15. 05 
6.12 
4.10 
2.95 
17. ws 
40.32 
50. 85 
2. 60 
2.26 
.24 
.26 
.37 
. 83 
.84 
n. d. 
14. 12 
40.11 
41.96 
.96 
.67 
ii. d. 
0. 26 
.20 
54.80 
.30 
.14 
n.d. 
43. 38 
.50 
1, 2, 3. Contra Costa County, between Mount Diablo and Pinole. 
. Benicia, Solano County." 
. Port Costa, Contra Costa County. 
SONOMA COUNTY. 
The following is an analysis by T. Price of a very pure limestone 
ccurring on Little Sulphur Creek, 4 miles east of Geyserville, 
onoma County: 
Analysis of limestone from Sonoma County, Cal.b 
Iica(Si0 2 ) 1.27 
lumina ( A1 2 3 ) | 
-on oxide (Fe 2 3 ) I 
ime carbonate (CaC0 3 ) 95. 20 
[agnesia (MgO) - 1. 32 
Pater ..... 1. 60 
REDDING DISTRICT. 
The limestones occurring in the Redding district are described as 
ollows by Mr. J. S. Diller in Bulletin 213, United States Geological 
>urvey, page 365: 
More limestone occurs in the copper region of Shasta County, Cal., than in an 
qual area of any other part of the State. A thick limestone of Triassic age occurs 
long the stage road east of Furnaceville, and subordinate masses crop out around the 
pper slope of Bear Mountain, a few miles northwest of Sherman, but the principal 
ciass of this belt forms Brock Mountain, on Squaw Creek, and may be traced for many 
nilcs to the north. This limestone is full of fossils and is especially noted for the 
arge lizard-like animals it contains. It is generally pure and at Brock Mountain 
| used for flux in the Bully Hill smelter. 
A belt of more prominent limestone ridges and peaks extends from near Lilienthals 
Lorth by Gray Rock, the Fishery, and Hirz Mountain, along the McCloud for many 
niles. The limestone where best developed is over 1,000 feet thick, and until 
ecently has been used for flux at Bully Hill. It is cut by numerous irregular dikes 
a Eighth Ann. Rept. California Slate Mineralogist, p. 882. 
b Eighth Ann. Kept. California State Mineralogist, p. 633. 
