238 
ANALYSES OF EOCKS, U. S. GEOLOGICAL SURVEY. 
[NO. 228, 
F. Biotite-augite-latite, 4 miles southwest of Clover Meadow. Tos- 
canose. Called u trachyte-andesite-tuff" in former edition of this bul- 
letin. Contains plagioclase, biotite, augite, magnetite, apatite, and 
glass. Analysis by W. F. Hillebrand, record No. 1597. P. R. C. 762. 
G. Augite-latite, Dardanelle flow, near Clover Meadow. Monzon- 
ose. Contains plagioclase, in part labradorite, augite, iron ore, some 
olivine, apatite, and brown glass. The potassium is probably in the 
glass, as no potash minerai was observed. Analysis by H. N. Stokes, 
record No. 1645. P. R. C. 785. 
H. Augite-latite, Table Mountain. Shoshonose. Called "basalt" 
in former edition. Contains labradorite, olivine, augite, and magnet- 
ite. Analysis by Hillebrand, record No. 1273. P. R. C. 724. 
I. Augite-latite, Table Mountain, near Clover Meadow. Shoshonose, 
Contains labradorite, augite, olivine, magnetite, apatite, and glass. 
Analysis by George Steiger, record No. 1697. P. R. C. 763. 
Si0 2 .. 
A1 2 3 . 
Fe 2 3 . 
FeO.. 
MgO . 
CaO.. 
Na 2 0. 
H 2 above 110° 
Ti0 2 
PA 
Zr0 2 
V 2 3 
MnO 
SrO 
BaO.... 
Li 2 
C0 2 
CI 
F 
c 
FeS 2 
62. 33 
17. 30 
3.00 
1.63 
1.05 
3.23 
4.21 
4.46 
.44 
.75 
1 . 05 
.29 
.04 
.01 
.08 
.05 
.24 
trace 
11 
(Hi 
100. 33 
59.43 
16.68 
2. 54 
3.48 
1.84 
4.09 
3.72 
5. 04 
.27 
.72 
1.38 
.58 
.08 
trace 
trace 
.14 
none 
.05 
trace 
100. 04 
ii. 
56.19 
16.76 
3.05 
4.18 
3.79 
6.53 
2.53 
4.46 
. 34 
.66 
.69 
.55 
.10 
trace 
.19 
trace 
100. 02 
56. 78 
16.86 
3. 56 
2.93 
3.41 
6.57 
3.19 
3.48 
.15 
1.21 
1.15 
.42 
none 
trace 
.18 
99.89 
