102 
ANALYSES OF KOCKS, U. S. GEOLOGICAL SURVEY. [bull. 168. 
O. Leucite-banakite lava sheet, southeast fork of Beaverdam Creek. 
Overlies rock G. Contains olivine, augite, leucite, feldspars, magnet- 
ite, 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P. Earlier unpublished analysis of O, another sample, by J. E. 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. Con- 
tains plagioclase, orthoclase, quartz, biotite, magnetite, augite, and a 
little calcite. Analysis by Melville, No. 1232. 
R. Quartz-banakite dike, near Q. Contains plagioclase, orthoclase, 
quartz, biotite, magnetite, augite, chlorite, and serpentine. Analysis 
by Melville, No. 1232. 
0. 
p. 
Q. 
R. 
Si0 2 * 
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 
4.13 
| 2.27 
.65 
.69 
trace 
57.29 
18.45 
4.38 
1.20 
2.08 
3.57 
4.43 
5.43 
.17 
2.01 
.72 
.46 
trace 
.12 
60.89 
17.14 
3.32 
.95 
1.16 
3.58 
4.54 
5.71 
.39 
1.22 
.49 
.27 
.09 
.19 
A1 2 3 
Fe 9 Oo 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 at 100° 
H 2 above 100° 
Ti0 2 
P 2 5 
MnO 
NiO 
BaO 
.21 
Li 2 
.13 
.21 
trace 
S0 3 
CI 
100. 09 
100. 29 
100. 31 
99.94 
