274 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[BULL. 1( 
6. TENMILE DISTRICT, SUMMIT COUNTY. 
Partial analyses, made in the Denver laboratory, by W. F. Hillebraiu 
C0 2 calculated to satisfy bases. Manganese and iron present as cai 
bonates, but Fe 2 3 and A1 2 3 were not separated from them. 
A. A. V. Fletcher shaft, Copper Mountain. 
B. Pittston tunnel. 
C. Middle Carboniferous, Pearl Hill. 
D. Summit quarry. 
E. Dolomite, Sheep Mountain. 
F. Oolitic limestone, northwest corner of area. 
G. Pittston tunnel. 
A. 
B. 
c. 
D. 
E. 
F. 
G. 
Insoluble . . . 
FeO, MnO . . 
OaO 
MgO 
co 2 
2.69 
.21 
54. 23 
.21 
42.97 
.62 
.25 
55.24 
.24 
43.81 
10.09 
1.19 
28.01 
18.33 
42.63 
1.75 
.32 
53.60 
1.23 
43.65 
.78 
1.50 
30.55 
20. 15 
47.04 
1.37 
.20 
55.17 
.28 
43.76 
7.91 
.32 
50.83 
.70 
40.90 
100. 31 
100. 16 
100. 25 
100. 55 
100. 02 
100. 78 
100. 66 
H. Dolomite, Blackbird tunnel, Tucker Mountain. 
I. Summit King shaft, Summit City. 
J. Middle Carboniferous dolomite, Ptarmigan Hill. 
K. Hill north of Sugar Loaf. 
L. Quarry on southeast side of Searls Gulch. 
M. Open cut below Sabbath Rest tunnel, Elk Mountain. 
N. Triassic, Jacque Mountain. 
H. 
I. 
J. 
K. 
L. 
M. 
N. 
Insoluble . . . 
FeO, MnO . . 
CaO 
MgO 
co 2 
2.68 
1.52 
31. 60 
18.27 
45.75 
6.75 
3.08 
28.05 
18. 15 
43.88 
.65 
1.67 
30.90 
19. 75 
47.02 
4.42 
.10 
52.97 
.40 
42.12 
.36 
.17 
55.58 
.37 
44.17 
.82 
.07 
55.47 
.22 
43.86 
2.04 
.15 
54.62 
.25 
43.28 
99.82 
99.91 
99.99 
100. 01 
100. 65 
100. 44 
100. 34 
