326 ANALYSES OF ROCKS, IT. S. GEOLOGICAL SURVEY. [no. 228^ 
2. LEADVILLE DISTRICT. 
Rocks described by Emmons in Mon. XII. Analyses A and E by 
W. F. Hillebrand; B, C, and I) by A. Guyard; all made in the Den- 
ver laboratory. 
A. Upper bine limestone, Silver Wave mine. 
P>. Upper bine limestone, Dugan quarry. 
C. Upper blue limestone, Glass-Pendery mine. 
D. Montgomery quarry, near base of blue limestone. 
E. White limestone, upper part, Carbonate Hill quarry. 
A. 
B. 
C. 
D. 
E. 
Si0 2 
.21 
.27 
.21 
.24 
trace 
30. 79 
21.14 
.03 
.06 
. 22 
trace 
46. 84 
trace 
.10 
trace 
. 03 
.70 
.17 
.11 
. 38 
. 05 
30. 43 
20. 78 
. 05 
.09 
.04 
. 12 
46. 93 
.27 
.04 
.22 
.13 
.20 
29.97 
21.52 
.01 
.02 
.07 
.03 
47. 39 
7.76 
.11 
.10 
.57 
.06 
27. 26 
20. 05 
.02 
.04 
.05 
.07 
43. 79 
trace 
. 06 
trace 
.07 
11.84 
A1 2 3 
1.66 
Fe 2 3 
FeO 
1.51 
.83 
MhO 
CaO -- 
Mg< > 
26. 60 
17.41 
K 2 
.02 
Na,<) 
II..O 
.03 
.48 
P 2 5 
C0 2 
trace 
40.01 
so, 
ci- 
FeS., 
.14 
trace 
.03 
.04 
.02 
.05 
( Organic matter 
100. 14 
100. 02 
99.93 
100. 01 
100. 44 
