258 
ANALYSES OF ROCKS, IT. S. GEOLOGICAL SURVEY. [no. 228. 
G. Hypersthene-augite-andesite, crater rim. just south of "The 
Watchman." Tonalose. Same minerals as F. P. R. G. 1310. 
H. Hypersthene-augite-andesite, Palisades, under Round Top, north- 
east portion of the rim. Tonalose. Contains plagioclase, hypersthene, 
augite, and magnetite. P. R. C. 1312. 
I. Hypersthene-augite-andesite, lake level, under Llao Rock. Tonal- 
08e. Same minerals as H. P. R. G. 1311. 
J. Basalt, base of Red Gone. Andose. Contains plagioclase, augite, 
olivine, and magnetite, with some glass base. P. R. G. 1321. 
G. 
H. 
I. 
J. 
SiO 
60.98 
17.82 
1.83 
3.33 
2. 76 
5.73 
4.26 
1.43 
.13 
.45 
.71 
.17 
none 
trace 
.05 
.06 
none 
trace 
62. 09 
17.03 
2.38 
2.69 
3.08 
5.65 
4.10 
1.67 
.04 
.13 
.65 
.19 
none 
trace 
.07 
.07 
none 
trace? 
58.41 
17.85 
2.67 
3.29 
3.61 
6.81 
3.77 
1.23 
.34 
.86 
.69 
.24 
none 
trace 
.05 
.05 
trace 
trace 
52.99 
ALO* 
16.71 
Fe.,0* 
3.80 
FeO 
3.55 
M2O 
6.95 
CaO 
8.49 
Na 2 
3.56 
K 2 
1.29 
H 2 at 110° 
.18 
H.,0 above 110° 
.59 
Ti() 2 
1.18 
P 2 5 
.42 
Ni() 
.02 
Mn( ) 
trace 
SrO 
.12 
BaO 
.07 
Li,( ) 
none 
CI 
trace 
99.71 
99. 84 
99.87 
99.92 
