334 ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
NEVADA AND CALIFORNIA. 
A. Crystalline limestone, Eureka, Nevada. Analysis by E. A. 
Schneider, record No. 1270. 
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, 4:9. In D the C0 3 was taken 
by difference. 
A. 
B. 
c. 
D. 
.53 
Si0 2 
24. 00 
.12 
.12 
3. 94 
.64 
.43 
.20 
.61 
51.96 
.52 
traces 
} .37 
.50 
40.71 
. 03 
.01 
9.34 
Al.,<>, 
.31 
Fe-O, 
.29 
FeO 
MnO 
( )a( ) 
30.60 
21. 69 
41.97 
.80 
traces 
} ■« 
.07 
32. 62 
traces 
.01 
50.01 
Mgo : 
.54 
Alkalies 
traces 
H 2 at 100° 
I -«l 
H 2 () above 100° 
r.,< > 5 
.24 
CO., 
47.13 
39 11 
Organic matter 
traces 
CI 
.03 
99.95 
99.87 
99. 92 
100. 00 
