CLARKE.] 
CLAYS, SOILS, ETC. 
291 
MARYLAND. 
Clays from the Matawan formation, received from W. B. Clark. 
Analyses by George Steiger, record No. 1684. 
A. Below Barnard's wharf, near Betterton, Kent County. 
B. Severn River, below Round Bay, Anne Arundel County. 
C. Magothy River near Wilson's wharf, Anne Arundel County. 
D. Fort Washington Bluff. 
Si0 2 
A1A« 
Fe 2 3 
MgO 
CaO 
Na 2 
K 2 
H 2 Oatl00°.... 
H 2 above 100° 
so 3 
A. 
73.47 
12.69 
4.62 
.59 
.15 
.09 
1.55 
.89 
3.85 
.19 
S.09 
87.15 
6. 46 
2.15 
.27 
.10 
.14 
.90 
.32 
1.90 
none 
c 
99.39 
82.86 
6. 49 
3. 54 
.52 
.29 
.16 
1.16 
.69 
2.24 
.21 
in 
73. 02 
10.00 
4.78 
.90 
.57 
.59 
1.92 
1.09 
3.07 
1.04 
96.98 
a Titanic and phosphoric oxides not separated. 
No carbonates present. Sulphides undetermined. 
