CLARKE.] 
CLAYS, SOILS, ETC. 
297 
WISCONSIN. 
Clays, etc., described by Chamberlin and Salisbury in 6th Ann., pp. 
250 and 282. Analyses by R. B. Riggs, record Nos. 259, 260, 261, 262, 
290, 295. Dried at 100°/ 
A. Residuary clay from Dodgeville, 4£ feet below surface. 
B. The same, 8J- feet below surface. 
C. Residuary clay from near Cobb, 4£ feet below surface. 
D. Same as C, 3i feet below surface. 
E. Red, putty-like clay, containing pebbles, Milwaukee. 
F. Red pebble clay, Milwaukee. 
A. 
B. 
c. 
D. 
E. 
F. 
Si0 2 
ALA 
FeA 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 
Ti0 2 
p 2 o 5 
MnO 
C0 2 
C, organic .. 
S0 3 
71.13 
12.50 
5.52 
.45 
.38 
.85 
2.19 
1.61 
4.63 
.45 
.02 
.04 
.43 
.19 
49.59 
18.64 
17.19 
.27 
.73 
.93 
.80 
.93 
10.46 
.28 
.03 
.01 
.30 
.34 
49.13 
20.08 
11.04 
.93 
1.92 
1.22 
1.33 
1.60 
11.72 
.13 
.04 
.06 
.39 
1.09 
53.09 
21.43 
8.53 
.86 
1.43 
.95 
1.45 
.83 
10.79 
.16 
.03 
.03 
.29 
.22 
40.22 
8.47 
2.83 
.48 
7.80 
15.65 . 
.84 
2.36 
1.95 
.35 
.05 
trace 
18.76 
.32 
.13 
.06 
48.81 
7.54 
2. 53 
.65 
7.05 
11.83 
.92 
2.60 
2.02 
.45 
.13 
.03 
15.47 
.38 
.05 
.04 
CI 
100.39 
100.50 
100. 68 
100. 09 
100. 27 
100.50 
