34 ECONOMICAL GEOLOGY. 



No. Ft. 



1. Surface soil 5 



2. Quicksand 15 



3. Sand with gravel and boulders 17 



4. Sand and clay mixed 53 



5. Hardpan 12 



6. Gravel 1 



7. Hardpan 4 



8. Clay and sand 4 



9. Gravel and clay 7 



10. Hardpan 3 



11. Clay and sand 7 



12. Clay and gravel 14 



13. Clay 4 



14. Hardpan <> 



15. Clay and gravel 8 



16. Quicksand 5 



17. Sand and gravel 2 



18. Coarse gravel 2 



19. Clay 



20. Gravelly hardpan 25 



21. Quicksand 6 



22. Sand and clay 7 



23. Gravel 9 



24. Sand 11 



25. Gravel 9 



26. Sani 9 



27. Quicksand and gravel 101 



Total depth of drift 352 



This is probably the same valley described in the foregoing 

 chapter, which was traced by Prof. Bradley into Champaign 

 county from whence its course was apparently west through 

 DeWitt, and thence northwardly through McLean county where 

 it was again penetrated in the Blooniington coal shafts. 



The following strata of coal measure rocks were passed 

 through in the Clinton boring. 



No. Ft. In. 



1. Black slate 1 



2. Fire clay 3 



3. Limestone 19 



4. Fire clay 1 



5. Gray shale 1 



6. Bed and gray shale 10 



7. Gray shale 2 



8. Sandstone 36 



9. Gray sha'.e ., 32 



Dark shale 6 



10. Gray shale 5 



11. Coal 2 9 



12. Coal and slate 9 



