220 THE CLAYS OF ARKANSAS. 
There are said to be some very fine clays on Lapile Creek in T. 
18 S., R. 13 W., probably in sec. 9 or 10. 
At Wilmington Landing the Tertiary beds are well exposed in the 
river bluff and in the gullies that furrow its sides. 
Section of river bluff' at Wilmington Landing. 
Feet. 
1. Sand on hilltop 2 
2. Sandy clay 5 
3. light-gray clay 2 
4. Pinkish clay 3 
5. White sand with some clay 9 
6. Pat buff clay with some sandy patches and lignite 16 
7. Tough, somewhat sandy, light-colored clay 7 
8. Fat gray clay ' 6 
m 9. White sand 3 
10. Outcrop of brown coal 3 
11. Fat dove-colored clay ,. 3 
12. Sands with clay laminae 5 
13. Pink sandy clays with fossil leaves 6 
14. Sandy clays and sands 10 
15. Concealed to the level of Ouachita River 10 
90 
The hills one-eighth of a mile south of Wilmington Landing con- 
tinue upward the section given above. It is approximately as 
follows : 
Section south of Wilmington Landing. 
Clays and clayey sands at the surface. Feet. 
Lead-colored and pink pottery clays 12 
Sands 6 
Chocolate-colored sandy pottery clays 4 
Lignite 3 
The horizontality of the Tertiary beds of the region and the out- 
crops of lignite along the bluffs and foothills of the region point to a 
wide distribution in Union County of the clay beds exposed in the 
section given above. 
A specimen of the clay bed No. 6 of the Wilmington Landing sec- 
tion was analyzed. 
Analysis of buff clay from Wilmington Landing. 
[Specimen dried at 135° C. W. A. Noyes, analyst.] 
Silica (Si0 2 ) 64. 97 
Titanic oxide (Ti0 2 ) 40 
Alumina ( A1 2 3 ) 18. 87 
Iron oxide (Fe 2 3 ) 5. 26 
Lime (CaO) 63 
Magnesia (MgO) 1. 00 
Potash (K 2 0) 1. 43 
Soda (Na 2 6) 30 
Water (H 2 0) 7. 43 
100.29 - 
