CLARKE.] 
CARBONATE ROCKS. 
319 
J. Iron carbonate, Penokee iron range, NE. i 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 (umnint Lake, Minnesota. 
N. Iron carbonate, north side of (iunnint Lake, Minnesota. 
O. Iron carbonate, north side of Gunflint Lake, Canada. 
Analyses, J, K, and L by R. B. Biggs, record Nos. 376, 377, 378; 
M, N, and O by T. M. Chatard, record Nos. 897, 898, 900. Rocks 
M, N, and O are described by Clements in Mon. XLV, p. 380. 
Si0 2 
TiO, 
FeA ■ 
FeO 
MnO 
CaO 
MgO 
H 2 Oat 110°... 
H 2 at redness 
P 2 5 
co 9 
15. 62 
4.27 
8. 14 
32. 85 
5.06 
.81 
2.66 
3. 41 
6. 42 
22. 92 
.40 
1. 26 
3. 98 
M. 
N. 
54. 26 
-■ { 
2. 57 
3.62 
9. 63 
.19 
1.07 
2. 93 
1.20 
30.32 
JS. 01 
58 
23 
trace? 
06 
5 
01 
18 
48 
25 
38 
9 
59 
14. 93 
.07 
2. 01 
.03 
5.22 
46. 46 
trace? 
.24 
.64 
26. 34 
.21 
1.87 
3.10 
.07 
1.15 
.13 
19.96 
23. 90 
none 
.07 
.44 
10. 72 
.28 
22.25 
8.52 
none 
.99 
trace 
32.42 
so 3 
.19 
. 14 
.17 
c 
3.54 
.45 
100.41 
100.41 
100. 85 
99.52 100.31 
99. 76 
