266 
ANALYSES OF ROCKS, IT. S. GEOLOGICAL SURVEY 
[BULL. 168. 
J. Iron carbonate, Penokee iron range, NE. J sec. 6, T. 45, R. 2 E., 
Wisconsin. P. R. C. 999. 
K, L. Black, slaty, carbonaceous iron carbonates, Animikie forma- 
tion, Kakabikka Falls, Kaministiquia River, Canada. 
M. Iron carbonate, west end of Gunnint Lake, Minnesota. 
N. Iron carbonate, north side of Gunnint Lake, Minnesota. 
O. Iron carbonate, north side of Gunnint Lake, Canada. 
Analyses J, K, and L by R. B. Riggs, record Nos. 376, 377, 378; 
M, N, and O by T. M. Chatard, record Nos. 897, 898, 900. 
J. 
K. 
L. 
M. 
N. 
0. 
Si0 2 
. 15.62 
37.73 
54.26 
58.23 
trace ? 
.06 
5.01 
18.48 
.25 
.38 
9.59 
.07 
2.01 
.03 
5.22 
.19 
46.46 
trace ? 
.24 
.64 
26. 34 
.21 
1.87 
3.10 
.07 
1.15 
.13 
19.96 
.14 
23.90 
none 
.07 
.44 
10.72 
.28 
22.25 
8.52 
none 
.99 
trace 
32.42 
.17 
Ti0 2 
A1 2 3 
4.27 
8.14 
32.85 
5.06 
.81 
2.66 
| .68 
3.41 
6.42 
22.92 
.40 
1.26 
3.98 
| 2.74 
2.57 
3.62 
19.63 
.19 
1.07 
2.93 
| 1.20 
Fe 2 3 
FeO 
MnO 
CaO 
MgO 
H 2 Oat 110° 
H 2 at redness. . 
co 2 
30.32 
18.01 
14.93 
so 3 
c .. 
3.54 
.45 
100. 41 
100. 41 
100. 85 
99.52 100.31 
99.76 
