118 
ANALYSES OF ROCKS, tf. S. GEOLOGICAL SURVEY. 
[NO. 228. 
O. Leucite-banakite lava sheet, southeast fork of Beaverdam Creek. 
Shoshonose. Overlies rock G. Contains olivine, augite, leucite, feld- 
spars, magnetite, apatite, and a little brown mica. Analysis by Eakins, 
No. 1378. 
P. Earlier unpublished analysis of O, another sample, by J. E. 
Whitfield, record No. 907. 
Q. Quartz-banakite dike, near head of Stinkingwater River. Mon- 
zo?wse. Contains plagioclase, orthoclase, quartz, biotite, magnetite, 
augite, and a little calcite. Analysis by Melville, No. 1232. 
R. Quartz-banakite dike, near Q. PulasJcose. Contains plagioclase, 
orthoclase, quartz, biotite, magnetite, augite, chlorite, and serpentine. 
Analysis by Melville, No. 1232. 
Q. 
Si0 2 _. 
ALA- 
Fe 2 3 
FeO.. 
MgO. 
CaO.. 
Na 2 . 
K,0.. 
H 2 above 100° 
Ti0 2 
PA 
MnO 
MO 
BaO 
Li 2 
S0 3 
CI 
52. 93 
19. 67 
3.07 
3. 50 
2.88 
4.69 
4.20 
4.75 
2.73 
.72 
.59 
.15 
51. 56 
21.00 
5.17 
2.76 
2.52 
4.83 
4.37 
1.13 
2.27 
.65 
.69 
trace 
. 13 
.21 
trace 
57.29 
18.45 
4.38 
1.20 
2.08 
3.57 
4.43 
5.43 
.17 
2.01 
.72 
.46 
trace 
.12 
60. 
17. 
3. 
1. 
3. 
4. 
5. 
100.09 
100. 29 
100. 31 
99.94 
