WILCOX CLAYS. 63 
Analysis of Frisco fire clay No. 2, Marshall County. 
[By W. F. Hand, State chemist.] 
Silica (SiOs) 84.40 
Alumina ( A1 2 3 ) 6. 79 
Ferric oxide (Fe 2 3 ) 1. 30 
Lime (CaO) 85 
Magnesia (MgO) 27 
Sulphur trioxide (S0 3 ) 17 
Moisture 74 
Loss on ignition 5. 36 
99.88 
Whitelock clay. — The Whitelock clay outcrops at the spring where the Illinois Central 
Railroad crosses the public road, 2 miles south of Holly Springs. It is a white plastic clay 
flecked with mica, and occurs in stratified sands 40 feet below the base of the Lafayette. 
It burns to a cream color. An analysis of this clay is given below: 
Analysis of Whitelock clay, Marshall County. 
[By W. F. Hand, State chemist.] 
Silica (SiOs) 66. 66 
Alumina (A1 2 3 ) 22. 29 
Ferric oxide (Fe 2 3 ) 1. 57 
Lime (CaO) 62 
Magnesia (MgO) 28 
Sulphur trioxide (S0 3 ) 11 
Moistu re 1. 23 
Loss on ignition 2. 41 
95.17 
Wyley clay. — A very white nonplastic clay occurs in stratified layers near the house of 
Sid. Wyley, in sec. 16, T. 8 S., R. 4 W., Lafayette County. The following section was taken 
from the gully in which the clay outcrops: 
Section on Wyley place, in sec. 16, T. 8 8., R. Jf. W. 
5. Yellow loam and Lafayette at surface. Feet. 
4. Impure sandy clay 2 
3. White plastic clay from which sample was taken 10 
2. Impure yellow clay 1| 
1. Whitish-gray sand to bottom of gully 2 
At the base of the yellow clay is a thin band of ferruginous sandstone and numerous 
concretions of iron clay stones. The following analysis has been made of this clay: 
Analysis of Wyley clay, Lafayette County. 
[By W. F. Hand, State chemist.] 
Silica (Si0 2 ) 57. 48 
Alumina ( A1 2 3 ) 26. 94 
Ferric oxide (Fe 2 3 ) 2. 43 
Lime (CaO) 78 
Magnesia (MgO) 27 
Sulphur trioxide (S0 3 ) 20 
Moisture 1. 64 
Loss on ignition 8. 99 
98. 73 
Callicoatt clay. — An outcrop of clay occurs near C. C. Callicoatt's house, in sec. 16, T. 9 S., 
R. 3 W. This clay is slightly yellowish, free from sand, and burns to a rich cream color. 
There is an old Indian pottery near by, with numerous pieces of pottery which were made 
from this clay bank. The following is an analysis of the Callicoatt clay : 
