272 ANALYSES OF KOCKS, U S. GEOLOGICAL SUKVEY. [bull. 168. 
3. FAIRPLAY, PARK COUNTY. 
Analyses made by W. F. Hillebrand, in the Denver laboratory. 
A. Serpentinous limestone, Buckskin Gulch. 
B. Limestone, Fairplay. 
C. Limestone, Mount Silverheels. 
D. Dolomite-limestone, Mount Silverheels. 
Analyses B, C, and D partial, with C0 2 calculated to satisfy bases. 
A. 
B. 
c. 
D. 
Insoluble 
2.37 
.51 
1.98 
Si0 2 
17.64 
.99 
.62 
.18 
trace 
32. 23 
19.01 
.07 
3.72 
.05 
25.33 
.08 
A1 2 3 
Fe 2 3 
FeO 
} ■» 
53.64 
.73 
! ■» 
55. 50 
.17 
| .46 
30.19 
20.47 
MnO 
CaO 
MgO 
Alkalies 
H 2 
.51 
P 2 5 
co 2 
42.93 
43.82 
46.52 
CI 
99.92 
100. 37 
100. 10 
99.62 
4. PITKIN COUNTY. 
Limestones and dolomites collected under the direction of S. F. 
Emmons. Analyses by George Steiger, record No. 1559. C0 2 calcu- 
lated to satisfy bases. Analyses partial only. 
A. 
B. 
c. 
D. 
E. 
F. 
G. 
Insoluble . . . 
"Fe 2 3 
FeO 
CaO 
MgO 
co 2 
.16 
.22 
.09 
30.66 
20.94 
47.13 
.80 
1.63 
.23 
31.19 
19.69 
46.16 
1.02 
2.10 
.06 
33.74 
16.76 
44.94 
13.63 
1.88 
.64 
35.98 
8.25 
37.35 
1.42 
3.34 
.42 
31.61 
18.06 
44.70 
31. 12 
.36 
.19 
37.28 
.54 
29.88 
7.78 
.88 
.22 
38.85 
9.97 
41.47 
99.20 
99.70 
98.62 
97.73 
99.55 
99.37 
99.17 
