276 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[BULL. 161 
NEVADA AND CALIFORNIA. 
A. Crystalline limestone, Eureka, Nevada. Analysis by E. A 
Schneider, record No. 1279. 
B. From base of the Hamburg limestone, Eureka district, Nevada 
C. From summit of Hamburg- limestone, Eureka. 
D. Pogonip limestone (Silurian), Eureka district. Analyses B, C, 
and D made by W. F. Hillebrand in the Denver laboratory. De- 
scribed by Hague in Mon. XX, pp. 40, 49. In D the C0 2 was taker 
by difference. 
E. Cretaceous limestone from Mount Diablo, California. Analysis 
made by W. H. Melville in the San Francisco laboratory and pub- 
lished in Bull. Geol. Soc. Amer., vol. 2, p. 409. FeO and alkalies unde- 
termined. 
F. White deposit, White Terrace, west shore of Pyramid Lake, 
Nevada. Analysis by T. M. Chatard, record No. 34. 
A. 
B. 
c. 
D. 
E. 
F. 
Insoluble 
.53 
Si0 2 
24.00 
.12 
.12 
3.94 
.64 
.43 
.20 
.61 
51.96 
.52 
traces 
} ■« 
.50 
40.71 
.03 
.01 
9.34 
.31 
.29 
21.19 
.39 
1.52 
22.00 
5.14 
2.04 
A1 2 3 
Fe 2 3 
FeO 
MnO 
3.61 
35.61 
1.39 
CaO 
MgO 
30. 60 
21.69 
41.97 
.80 
traces 
} . M 
.07 
32.62 
traces 
.01 
50.01 
.54 
traces 
I •» 
.24 
39.11 
traces 
.03 
37.22 
1.89 
Alkalies . . 
H 2 at 100° 
.76 
2.33 
2.55 
26.84 
| 3.32 
H 2 above 100° . . . 
P 9 0. 
co 2 
47.13 
28.53 
Organic matter 
CI 
99.95 
99.87 
99.92 
100. 00 
96.19 
100. 14 
