CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
219 
M. Basalt, summit of Inskip Crater. 25 miles oast of Red Bluff. 
[Ativergnose. Mainly feldspar and augite, with a few phenocrysts of 
olivine. Analysis by Hilleb rand and Chatard, record No. 4of>. 
N. Basalt from the cone at south base of Burney Butte, Shasta County. 
lAndose. Composed of plagioclase and augite, with some olivine and 
a globulitic base. Analysis by R. B. Riggs, record No. 685. 
O. Basalt, near eastern end of rim of Crater Peak, Shasta County. 
'Hessose. Contains plagioclase and pyroxene, some of the latter being 
hypersthene with a trace of olivine. Analysis by R. B. Riggs, record 
No. 682. 
P. Hornblende-basalt, Kosk Creek near its mouth, b} r the great 
bend of Pit River, Shasta County. Auvergnose. Contains abundant 
phenocrysts of hornblende, with a few of plagioclase, pyroxene, and 
olivine, in a groundmass of plagioclase, augite, and magnetite. The 
hornblendes are deeply corroded, and some have disappeared, leaving 
groups of magnetite grains to murk their former presenee. Analysis 
by L. G» Eakins, record No. 1022. Described ]yy Diller in Amer. 
Geologist, vol. 19, p. 253. 
Rocks dried at 105° to 110° before analysis, except in the case of 
the rock marked L. 
Si0 2 
Fe 2 0, 
FeO . . 
MgO . 
CaO.. 
Na 2 . 
K,().. 
Ti0 2 . 
PA- 
Mn( > 
8r( ) . 
Ba(). 
Li 2 
C0 2 . 
K. 
51.92 
19.76 
11.21 
3.38 
9.30 
2.16 
.60 
1.54 
99.87 
47.93 
iS. 51 
2.07 
7.25 
9.03 
11.14 
2.28 
.24 
.76 
.73 
.11 
.20 
50.89 
in. 76 
3.86 
4.69 
8. 49 
1 1 . 72 
2. 61 
.32 
.41 
.79 
.09 
. 13 
trace 
N. 
52. 63 
17.62 
6.49 
3. 10 
5. 64 
8.62 
3.38 
1 . 73 
.79 
.07 
.47 
trace 
trace 
.04 
trace 
100.25 
trace 
100. 76 100. 58 
o. 
52.95 
18.25 
4.36 
4.19 
4.93 
s. 73 
3. 57 
. 77 
1.47 
.m 
trace 
.12 
truce 
.01 
CO 
trace 
r. 
44.77 
17.82 
5.05 
6.95 
8.22 
10.36 
2.13 
.92 
2.64 
.53 
.72 
trace 
100. 01 
100.11 
