218 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[BULL. 168. 
. E. Basalt, base of a lava flow, east of the head of the San Joaquin 
River, Madera County. Description supplied .by Turner. Hitherto 
unpublished. Contains pyroxene, partly augite, plagioclase, olivine, 
and iron ores. Analysis by W. F. Hillebrand, record No. 1767. 
F. Olivine-basalt, west peak of the Dardanelles, Alpine County. 
Described by Ransome in Bull. 89. Contains olivine, largely altered 
to iddingsite, plagioclase, serpentine, and augite. Analysis by George 
Steiger, record No. 1697. 
G. Mica separated from quartz-monzonite, near Bloods Station, 
Alpine County. Described by Turner in Amer. Journ. Sci., 4th series, 
vol. 7, p. 294. Analysis by William Valentine, record No. 1736. 
Si0 2 
A-1,0, 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 0, at 105°.. 
H 2 0, above 105 
Ti0 2 
PA 
Zr0 2 
MnO 
NiO 
SrO 
BaO 
Li 2 
G0 2 
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 
F. 
48.76 
16.60 
5.60 
5.01 
6.93 
8.79 
2.47 
.66 
1.49 
2.19 
1.26 
.19 
trace 
42 
100. 37 
G. 
35.62 
15.24 
4.69 
13.67 
12.70 
.95 
.50 
7.72 
.94 
4.36 
2.61 
trace 
.26 
trace 
100. 00 
