IGNEOUS AND CRYSTALLINE ROCKS. 148 
\ Bs fe ae BD; E 
- — - 
57. 25 56.70 | 56.53 | 55.93 79. 49 
16.45 | 15.75 | 17.50} 17.34 11. 60 
1.67 1.29 1.35 1.50 33 
4.72 5, 32 5.03 5. 20 49 
6.74 7.16 5.94 7.29 09 
40 30 27 26 68 
20 20 15 | undet. | undet. 
Sao trace | trace |........]...--... 
10 19 -12 | undet. none 
trace | trace | trace? (? ?) 
03 -03 | trace ? 3 
none | trace | trace . ?) ? 
100. 38 | 100.18 | 100. 56 | 100.23 99. 88 
F. Quartz basalt, one-half mile south of Cinder Cone, on border of lava field. Camp- 
tonose. Analysis by Hillebrand, No. 666. P. R. C. 794. 
G. Quartz basalt, west end of Lake Bidwell, on border of Cinder Cone lava field. 
Andose. Contains a few grains of quartz, much olivine and plagioclase, less pyroxene, 
and a globulitic base. Analysis by Hillebrand, No. 661. P. R. C. 795. 
H. Quartz basalt, Silver Lake, near Lassen Peak. Andose. Contains occasional 
grains of quartz, much feldspar and olivine, less pyroxene, and a brownish base. 
Analysis by Hillebrand, No. 662. P. R. C. 790. 
I. Quartz basalt, resting on dacite, near west base of Lassen Peak. Bandose. 
Analysis by Hillebrand, No. 677. P.R. C. 796. 
J. Quartz basalt, island of Mitylene, coast of Asia Minor. Tonalose. Analysis for 
comparison with the Cinder Cone series, by T. M. Chatard, record No. 845. 
Rocks F to I dried at 100° to 110° before analysis. 
- 86 . 69 1.43 
undet. 48 77 
undet. 14 15 
ecereialstns trace | trace? 
undet. -ll 16 
? a) ee 
- 04 07 
@ trace |....-... 
2. 32 
100. 78 | 100.10 | 100.39 
K. Recent basalt, Pit River. Rich in feldspar and augite, poor in olivine. Par- 
tial analysis by F. W. Clarke, record No. 109. 
L. Basalt, 1 mile southeast of Paynes Creek, on the road from Red Bluff to Lassen 
Peak. Auvergnose. A normal basalt, rather rich in olivine. Analysis by T. M. 
Chatard, record No. 405. P. R. ©. 1242. 
M. Basalt, summit of Inskip Crater, 25 miles east of Red Bluff. Auvergnose. 
Mainly feldspar and augite, with a few phenocrysts of olivine. Analysis by Hille- 
brand and Chatard, record No. 406. P. R. C. 1450. 
