100 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [bull. 168. 
F. Shoshonite lava sheet, Lamar River, south of Bison Peak. Con- 
tains plagioclase, orthoclase, augite, olivine, magnetite, and serpentine, 
with amygdules of zeolite and calcite. Analysis by Eakins, No. 1086. 
G. Shoshonite lava sheet, southeast fork of Beaverdam Creek. 
Contains plagioclase, orthoclase, augite, and serpentinized olivine. 
H. Leucite ( ?) shoshonite lava sheet, mountain east of Pyramid Peak. 
Contains feldspars, olivine, serpentine, augite, magnetite, brown mica, 
and impure leucite (?). 
I. Olivine-free shoshonite dike, northeast of Indian Peak. Con- 
tains augite, plagioclase, biotite, and magnetite. 
J. Shoshonite lava sheet, Two Ocean Pass. Contains orthoclase, 
serpentinized olivine, magnetite, augite, chlorite, biotite, apatite, lab- 
radorite. Dried at 104°. 
Analyses G, H, I by Eakins, Nos. 1371, 1375, 1379. Analysis J by 
Whitfield, No. 906. 
F. 
G. 
H. 
I. 
J. 
Si0 2 
50.06 
17.00 
2.96 
5.42 
3.61 
8.14 
3.53 
3.40 
4.85 
.51 
.66 
.14 
53.49 
17.19 
4.73 
3.25 
4.42 
6.34 
3.23 
3.86 
2.17 
.71 
.43 
.14 
.06 
52.49 
17.89 
5.76 
2.08 
3.49 
7.01 
3.18 
3.73 
2.63 
.81 
.55 
.09 
.30 
54.86 
17.28 
4.08 
2.28 
4.19 
5.42 
3.94 
3.96 
2.16 
.69 
.48 
.19 
.37 
56.05 
19.70 
3.74 
2.32 
2.51 
4.34 
3.29 
4.44 
1.86 
.98 
.66 
trace 
A1 2 3 
Fe 9 0, 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 
Ti0 2 
P 2 0, 
MnO 
BaO 
Li 2 
.06 
.19 
so 3 . . 
100. 28 
100. 02 
100. 01 
99.90 
100. 14 
