CLARKE.] 
CLAYS, SOILS, ETC. 
299 
G. 
H. 
I. 
2.41 
36.71 
8.21 
2.75 
38.59 
2.77 
.78 
7.99 
J. 
K. 
L. 
Insoluble 
Soluble Si0 2 .. 
A1A 
FeA 
ZnO 
34. 89 
16. 75 
7. 38 
10.34 
14. 35 
1.55 
.35 
10. 37 
11.25 
32. 89 
10.78 
3. 89 
29.54 
2.65 
.90 
8.22 
16.17 
28.62 
8. 93 
5.98 
26.23 
2.01 
.46 
9.19 
3. 85 
37. 08 
6.46 
3. 49 
38. 90 
2.56 
.42 
7.52 
18.18 
29. 02 
6.34 
4.40 
30. 50 
1.91 
.75 
8. 36 
CaO 
MgO 
Ignition 
95. 98 
100. 12 
100. 21 
97.59 
100. 28 
99.46 
COLORADO. 
A. Loess, Denver. 
B. Loess, Highland. 
C. Concretion in loess, Wray. 
A, B, and C collected by S. F. Emmons, analyses by L. G. Eakins, 
record No. 1066. 
D. Clay, Davis ranch, Pueblo quadrangle. 
E. Clay, head of Rock Creek, Pueblo quadrangle. 
D and E collected by G. K. Gilbert, analyses by George Steiger, 
record No. 1457. 
Si0 2 
AlA 
FeA 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oatl00°.... 
H 2 above 100° 
Ti0 2 
PA 
MnO 
C0 2 
Organic matter. 
A. 
69.27 
13.51 
3.74 
1.02 
1.09 
2. 29 
1.70 
3.14 
4.19 
.45 
trace 
trace 
100. 40 
B. 
60.97 
15. 67 
5.22 
.35 
1.60 
2.77 
.97 
2.28 
9.83 
.19 
trace 
.31 
100. 16 
70. 63 
10.43 
2.58 
.48 
1.13 
4.64 
1.29 
2.50 
3.77 
20 
2.59 
100. 24 
63.52 
24. 72 
.43 
.13 
.30 
trace 
trace 
1.58 
8.41 
.68 
trace 
.40 
100.17 
E. 
-6.56 
8.30 
.38 
.24 
.12 
trace 
trace 
1.26 
4. 40 
. 60 
.06 
8.31 
100. 23 
