122 THE CLAYS OF AKKANSAS. 
The following is an analysis of some of the clay produced by the 
disintegration of Nos. 1 and 2 of the above section, obtained from 
ditch at W. J. James's, in the southeast corner of the NW. 1 SE. I 
sec. 32, T. 10 N., R. 23 W.: 
Analysis of distintegrated shale from sec. 32. 
[Brackett & Smith, analysts.] 
Silica (Si0 2 ) 55. 3G 
Alumina (A1 2 3 ) 26. 96 
Ferric oxide (Fe 2 3 ) 5. 12 
Lime (CaO) 30 
Magnesia (MgO) 1. 16 
Potash (K 2 0) 2. 69 
Soda (Na,0) 1. 03 
Loss on ignition (water) 7. 90 
100. 52 
Water at 110°-115° C 3. 90 
A specimen of blue clay shale overlying a 2-inch bed of coal col- 
lected by Mr. William Kennedy northwest of Clarksville in the SE. \ 
SW. \ sec. 31, T. 10 N., R. 23 W., has been analyzed by the Arkansas 
Geological "Survey. 
Analysis of disintegrated shale from sec. 31. 
[Brackett & Smith, analysts.] 
Silica (Si0 2 ) 51. 30 
Alumina ( A1 2 3 ) 24. 69 
Ferric oxide (Fe 2 3 ) 10. 57 
Lime (CaO) 32 
Magnesia (MgO) 63 
Potash (K 2 0) 2. 18 
Soda (Na 2 0) 72 
Loss on ignition (water) 9.11 
99.52 
Water at 110°-115° C 4. 92 
The section exposed where this specimen was taken by Mr. Kennedy 
is given below, and the specimen analyzed was from No. 2 of the 
series. 
Section in SE. \ NW. \ sec. 31, T. JO N., R. 23 W. 
Ft. in. 
1. Waterworn gravels 1 
2. Blue and yellow shales 8 
3. Coal 2 
4. Blue shales with red streaks 4 
5. Black shales at base of section. 
The abundance of clays and clay shales in Johnson County and 
their proximity to good coal and to transportation both by railway 
and by water insure facilities for the extensive manufacture of 
paving bricks, sewer pipes, and fire-clay products. 
