130 
ANALYSES OF BOOKS, TJ. S. OEOLOGIOAL SURVEY. 
[no. 228. 
J. Hornblende-picrite, North Meadow Creek. Wehrlose. Contains 
hornblende, abundant fresh olivine, grains of pleonaste and iron oxides, 
and occasionally hypersthene. Sp. gr., 3.35. P. R. C. 973. 
K. Pyroxenite, divide between Meadow and Granite creeks. Cook- 
ose. Contains hornblende and hypersthene, with grains of iron oxide. 
P. R. C. 972. 
L. Hypersthene-andesite, northwest of Red Bluff. Tonalose. Con- 
tains plagioclase and p} T roxene, with an amorphous glassy base, and 
sometimes olivine altered to chloritic matter. 
M. Peridotite, var. wehrlite, hills 3 miles northwest of Red Bluff. 
Wehrlose. Contains olivine, diallage, brown mica, rarely plagioclase, 
and secondary iron oxides. Sp. gr., 3.37. Analyses J, K, L, and M 
by Eakins, record No. 12G6. P. R. C. 975 and 970. 
Si0 2 .. 
A1A- 
Fe 2 3 
FeO.. 
MgO. 
CaO.. 
Na 2 . 
K 2 0.. 
H 2 0.. 
Ti0 2 . 
PA . 
OA- 
MnO. 
NiO.. 
BaO.. 
S 
LessO 
46.13 
4.69 
.73 
16.87 
25. 17 
4.41 
.08 
trace 
1.38 
.73 
.07 
.04 
trace 
.09 
trace 
.24 
100. 63 
.12 
100. 51 
51.83 
7.98 
1.48 
8.28 
24. 10 
5.26 
.35 
.06 
.29 
.29 
.09 
.31 
trace 
.11 
100. 43 
59. 48 
16.37 
3.21 
3.17 
3.29 
4.88 
3.30 
2.81 
2.01 
.93 
.41 
.03 
.19 
trace 
.13 
100. 21 
M. 
48. 95 
5.69 
1.20 
12.11 
23.49 
5.33 
1.58 
.79 
.18 
.81 
.12 
.05 
.08 
.16 
trace 
100. 54 
