CLAYS AND SOILS. 
SOUTH DAKOTA, WYOMING. 
363 
A. Red clay, east of Newcastle, South Dakota. 
B. Red clayey sandstone, east of Spearnsh, South Dakota. Analy- 
ses A and B by George Steiger, record No. 1854. 
C. Loess, Cheyenne, Wyoming. Analysis by L. (I. Eakins, record 
No. 1066. 
Si0 2 
ALA 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oatl00°... 
H 2 above 100 
Ti0 2 
C0 2 
P 2 5 
so 3 
CI 
MnO 
56. 20 
11. 50 
3.64 
.65 
4.23 
5.83 
.98 
3. 74 
1.61 
2.84 
.77 
5.72 
.12 
2.26 
trace 
.10 
100. 19 
B. 
58. 32 
8.59 
2.04 
.18 
3.65 
8. 45 
.72 
2.71 
.52 
1.40 
.48 
12.08 
.05 
.43 
trace 
.07 
99. 69 
67.10 
10.26 
2. 52 
.31 
1.24 
5. 88 
1.42 
2.68 
5.09 
3.67 
.11 
100. 28 
