CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
219 
H. Scoriaceous rhyolite, Mono Craters, south of Mono Lake. 
Described by Russell in 8th Ann., Part I, p. 380. Analysis by T. M. 
Chatard, record No. 36. 
I. Obsidian, Mono Lake. Analysis by W. H. Melville, record No. 
1346. Described by Lindgren in Bull. 150, p. 149. P. R. C. 60. 
J. Pumice, Mono Lake. Analysis by Melville, No. 1346. Described 
by Lindgren in Bull. 150, p. 148. P. R. C. 59. 
K. Volcanic ash, east shore of Owens Lake. Collected and analyzed 
by Chatard, record No. 783. 
H. 
I. 
J. 
K. 
Si0 2 
74. 05 
13.85 
trace 
75.78 
12.39 
.22 
1.25 
.31 
.81 
4.00 
4.64 
} •« 
67.39 
15.99 
.56 
1.99 
. 77 
1.63 
4.74 
4.80 
| 2. 06 
55.81 
10.07 
3.43 
.67 
2.22 
1.05 
.75 
2.98 
.65 
2.50 
.80 
.27 
.23 
14.44 
1.45 
.80 
2.09 
AL0 3 
Fe 2 8 
FeO 
MgO 
.07 
.90 
4.60 
4.31 
| 2.20 
CaO 
Na 2 
K 2 
H 2 at 110° 
H 2 above 110° 
Ti0 2 
P 2 5 
MnO 
CaC0 3 . 
NaCl, soluble 
Na 2 S0 4 , soluble 
Na 2 C0 3 , soluble _... 
99.98 
99.81 
99.93 
100. 21 
