ST. FRANCIS COUNTY. 181 
Section of well at Brinkley, about 8 miles west of St. Francis County. 
Feet. 
Yellow clay 12 
Yellow sand 17 
Blue mud 1 
Quicksand 6 
Hard clay 25 
Coarse gravel (?) 
The yellow surface clay which occurs so extensively over the 
prairie region west of the ridge forms in places the limonite buckshot 
land. 
Below are given three analyses of the brick clays from St. Francis 
County : 
Analysis of loess soil from Crowleys Ridge, at Forrest City. 
[J. P. Smith, analyst.] 
Silica and insolubles 70. 30 
Ferric oxide (Fe 2 3 )| 16 g6 
Alumina (A1 2 3 ) j 
Lime (CaO) 1. 00 
Magnesia (MgO) 1. 22 
Potash (K 2 0) 54 
Soda (Na 2 0) 89 
Phosphoric acid (P 2 5 ) Trace. 
Loss on ignition 2. 83 
99.64 
Analysis of buckshot clay from Goodwin Prairie, 4 miles northwest of Goodwin station. 
[J. P. Smith, analyst.] 
Silica (Si0 2 ) 82. 52 
Alumina (A1 2 3 ) 7. 50 
Iron oxide (Fe 2 3 ) 4. 32 
Lime (CaO) Trace. 
Magnesia (MgO) 40 
Potash (K 2 0) 52 
Soda (Na 2 0) 63 
Manganese (MnO) Trace. 
Phosphoric acid (P 2 5 ) Trace. 
Loss on ignition 3. 64 
100. 34 
Water at 115° C 7. 82 
The following sample was taken from the material about a newly 
dug well about 4 miles northeast of Goodwin station, on the railway: 
Analysis of hardpanfrom Goodwin Prairie. • 
[J. P. Smith, analyst.] 
Silica (Si0 2 ) 84. 04 
Ferric oxide (Fe 2 3 ) 3. 70 
Alumina (A1 2 3 ). C>. 32 
Lime (CaO) 34 
