CLARKE.] 
IGNEOUS AND CKYSTALLXNE BOOKS. 
213 
F. Dacite, east end of Chaos, northwest base of Lassen Peak. 
Lassenose. The youngest dacite of the region. Contains quartz, 
feldspar, biotite, and hornblende, embedded in a clear pumiceous glass. 
Analysis by W. F. Hillebrand, record No. 670. Described by Diller 
in Bull. 150, p. 21*. 
G. Secretion in F. Hessose. Consists chiefly of plagioclase and 
hornblende, with some olivine and clear glass. Analysis by Hille- 
brand, No. 671. 
H. Dacite (?), west side of old crater rim near the Thumb, at the 
head of Mill Creek, Shasta County. Yellowstonose. Shows pheno- 
crysts of hornblende, plagioclase, and pyroxene, and apparently of 
quartz, in a gray, microlitic groundmass. Analysis by Hillebrand, 
No. 674. 
1. Streaked dacite, falls of south fork of Bear Creek, Shasta County. 
Lassenose. Contains plagioclase with a little sanidine, hornblende, 
quartz, magnetite, some pyroxene inclusions, and glass base. Analysis 
by R. B. Riggs, record No. 524. P. R. C. 80. Described by Diller in 
Bull. 150, p. 213. 
J. Dacite-tuff, Rice's quarry, 6 miles southeast of Paskenta, Tehama 
County. Clear glass, with fragments of quartz, feldspar, and horn- 
blende. Analysis by George Steiger, record No. 1427. 
J 2. Another sample of J. Analysis b}^ E. T. Allen, record No. 
2020. See Diller, Amer. Journ. Sci., 4th series, vol. 15, p. 360. 
F. 
G. 
H. 
I. 
J. 
J 2. 
Si0 2 
68.72 
15. 15 
1.16 
1.76 
53. 35 
L9.22 
3.28 
4.48 
63.81 
17.07 
2.11 
2. L5 
68.10 
15. 50 
3.20 
none 
65. 78 
14. 87 
1.27 
1.00 
60.23 
A1 2 3 
18.64 
Fe 2 3 
3. 81 
FeO 
.88 
MgO 
1.28 
4.86 
2.28 
.10 
1.89 
1.64 
CaO 
3.30 
9. 76 
4.97 
3.02 
2.41 
6.04 
Na 2 
4.26 
2.89 
4.08 
4.20 
2.58 
3.87 
K 2 
2.78 
.99 
1.96 
3. 13 
2.71 
1.46 
H 2 at 100° 
2.87 
.95 
H 2 above 100° 
.74 
. 77 
1.03 
2.72 
4.32 
1.97 
Ti0 2 .... 
.31 
.56 
.38 
.15 
.57 
Zr0 2 
.01 
P 2 5 
.09 
.10 
.10 
.03 
.08 
.20 
MnO 
.11 
.03 
.07 
.15 
.03 
trace ? 
.09 
.03 
.04 
trace 
trace 
.06 
trace 
trace 
SrO 
.05 
BaO 
11 
Cr 2 3 
trace 
Li 2 
trace 
trace 
trace 
none 
99. 76 
100. 44 
100. 10 
100. 21 
99.78 
Kin. i:; 
