ILLUSTRATIONS. 
Page. 
Plate I. Geologic map of Arkansas Pocket. 
Fig. 1. Ideal section across folds in Carboniferous rocks of western Arkansas. . 17 
2. Residuary clay formed by decomposition of syenite 21 
3. Shales decaying at the surface 22 
4. Section on Dry Creek showing formation of clay by decomposition of 
limestone r 23 
5. Section at Arkadelphia 37 
6. Section east of Morrillton 01 
7. Diagram showing relations of structure to topographic relief in Faulk- 
ner County 91 
8. Section through Round Mountain and Meto Mountain 91 
9. Section through Meto Hills 91 
10. Section showing relations of shales to loam and soil about Conway 92 
11. Section at Atchison clay pit, Perla Switch 113 
12. Section of Parker Hill and Seely Mountain 139 
13. Section on Sandy Branch 140 
14. Section of kaolin deposits on Vaughn Creek 149 
15. Section of kaolin beds in Pike County 152 
10. Section at Benton showing relations of clay beds 189 
17. Section showing structure and relations of shales and sandstones from 
Coops Ridge to Salem 208 
18. Section through Biswell Hill 209 
19. Sections of bed* at Round Mountain 223 
20. Section through Round Mountain 223 
8 
