252 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[NO. 228. 
F. Basalt, base of a lava flow, east of the head of the San Joaquin 
River, Madera County. Andose. Description supplied by Turner. 
Hitherto unpublished. Contains pyroxene, partly augite, plagioclase, 
olivine, and iron ores. Analysis by W. F. Hillebrand, record No. 
1767. 
G. Olivine-basalt, west peak of the Dardanelles, Alpine County. 
Hessose. Described by Ransome in Bull. 89. Contains olivine, largely 
altered to iddingsite, plagioclase, serpentine, and augite. Analysis by 
George Steiger, record No. 1697. 
H. Mica separated from quartz-monzonite, near Bloods Station, 
Alpine County. Described by Turner in Amer. Journ. Sci., 4th series, 
vol. 7, p. 291. Analysis by William Valentine, record No. 1736. 
Si0 2 
A1 2 3 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oat 105°.... 
H 2 above 105° 
Ti0 2 
P 2 5 
Zr0 2 
MnO 
NiO 
SrO 
BaO 
Li 2 
CO, 
51.89 
15.28 
3.10 
3.60 
8.68 
7.38 
3.27 
2.57 
1.17 
1.37 
.91 
.61 
trace 
.12 
.02 
.09 
.15 
trace 
none 
100. 21 
48.76 
16.60 
5.60 
5.01 
6.93 
8.79 
2.47 
.66 
1.49 
2.19 
1.26 
.19 
none 
trace 
.42 
100. 37 
H. 
35.62 
15.24 
4.69 
13.67 
12.70 
.95 
.50 
7.72 
.94 
4.36 
2.61 
trace 
.26 
trace 
100. 00 
