244 GEOLOGY OF ILLINOIS. 



Artesian well, at Chatsworth, south-east qr. sec. 3, T. 26, E. 8 E. : 



Section. 



Ft. 



1. Soil and clay 4 



2. Yellow clay 4 8 



3. Elueclay 44 52 



4. Sand and gravel 8 60 



5. Blue clay 10 70 



6. Sand 5 75 



7. Hard-pan (clay and gravel) 53 128 



8. Sand 7 135 



9. Hard-pan and clay 52 187 



10. Soft clay and gravel 13 200 



il. Soapstone 21 221 



12. Limestone 69 290 



13. Limestone 94 384 



14. Limestone 70 454 



15. Limestone 115 569 



16. Black slate 40 609 



17. Gritstone 80 089 



18- limestone 65 754 



19. Limestone 70 824 



20. Dark shale ' 36 860 



31- Limestone 147 1,007 



22. Flint? 109 1,116 



23. Dark gray shale, with streaks of flint 84 1,200 



A comparison of the two borings above shows an abrupt change from 

 the Coal Measures to the older rocks and a great difference in the depth 

 of the drift. 



