WILCOX CLAYS. 59 
Analysis of F ant clay, Marshall County. 
[By W. F. Hand, State chemist.] 
Silica (SIOs) 70.86 
Alumina ( A1 2 3 ) 15. 68 
Ferric oxide (Fe 2 3 ) 4.50 
Lime (CaO) 45 
Magnesia (MgO) 79 
Sulphur trioxide (S0 3 ) 29 
Moisture 83 
Loss on ignition 6.12 
99.52 
Terr clay. —On Home Terr's land, in sec. 35, T. 2. S, R. 3 W., the stratified character of the 
Wilcox sands and clays is well shown in the section along the creek near the old water mill. 
A small side stream entering the creek at the mill has cut through the Lafayette and into the 
alternating beds of sands and clays beneath. At the base of the section is a yellow plastic 
clay from which a sample was taken. When made into a brick and burned it becomes of 
a rich buff color. The following section gives the relation of the different strata: 
Section on Terr place, in sec. 35, T. 2 S., R. 3 W. 
Inches. 
7. Lafayette 72 
6. Coarse micaceous sand, chocolate colored 6 
5. Yellow sand 6 
4. Yellow sand alternating with white clay one-fourth to 1 inch thick 5 
3. White joint clay, micaceous 8 
2. Yellow micaceous sand 48 
1. Yellow clay from which sample was taken; bottom of branch 24 
The following is the analysis of the Terr clay: 
Analysis of Terr clay, Marshall County. 
[By W. F. Hand, State chemist.] 
Silica (Si0 2 ) 63. 56 
Alumina (A1 2 3 ) 21. 92 
Ferric oxide (Fe 2 3 ) 2. 83 
Lime (CaO) 48 
Magnesia (MgO) 02 
Sulphur trioxide (S0 3 ) 28 
Moisture 1 . 92 
Loss on ignition 7. 66 
99.27 
Ballard clay . — In the oldfield surrounding the negro schoolhouse in sec. 30, T. 2 S., R. 2W., 
are numerous deep gullies. In many of these plastic, workable clays are exposed. 
At the bold spring near the schoolhouse is a small bluff showing 20 feet of coarse, orange- 
colored sand, with small streaks and lenses of clay throughout. At the base of the bluff is a 
large outcrop of very plastic white to pinkish clay which has given rise to the spring. The 
water filters down through the sand until it reaches the clay. On the opposite side of the 
schoolhouse from the spring is an outcrop of stratified clay in a gully. When exposed to 
the sun and air this clay, known as the Ballard clay, cracks into roughly rectangular blocks, 
as does the Parham clay. Like the Parham clay also it contains numerous fossil leaf im- 
pressions. The clay is white, contains but little sand, and burns almost white. An analysis 
of this clay is given below: 
