28 ECONOMICAL GEOLOGY. 



Feet. 



No. 18. Clay shale 36 



No. 19. Limestone 7 



No. :M. Clay shale 26 



No. 21. Sandstone 3 



No. 22. Clay shale 8 



No. 23. Limestone ... l 



No. 21. Black slate 2 



No. 25. Clay shale 10 



No. 26. Limestone 2 



No. 27. Clay shale 34 



No. 28. Saudyshale '. 4 



No. 29. Light gray sandy shale 85 



No. 30. Sandyshale 38 



No. 31. Clay shale 2 



No. 32. Sandy shale and sandstone 109 



Total depth , 775 



Harvel is about fifteen miles N.NE. of Litchfield, in Montgomery 

 county, and on comparing the above boring with the shaft and 

 boring at the latter locality, given on a subsequent page, it will be 

 seen that there is no correspondence worthy of note between them. 

 The thinning out and consequent disappearance of a coal seam in 

 certain localities is not an unusual occurrence, but the entire 

 absence of a half dozen seams where they might be expected to 

 occur, is quite an extraordinary occurrence. 



For the following record of the escapement shaft at Dawson, in 

 Sangamon county, sunk by the Wabash Coal Company, I am in- 

 debted to Mr. Thomas P. Mowitt: 



Ft. In. 



No. 1. Surface soil, clay and sand M 



No. 2. Clay shale, with bands of hard rock ...105 



No. 3. Blue shale 3 



No. 4. Hard conglomerate ! 



No. 5. Fire-clay.. 4 



No. 10. Red shale ",'j". 10 



No. 11. Bastard slate 3 < 



No. 12. CoalNo.O " Q l 



No. 13. Fire-clay 



No. 14. Hard brown rock 



No. 15. Hard gray sandstone 36 



No. 10. Clay shale '.".'.'."'.'.'.'.'.'. " J 2 



No. 17. Limestone (cap-rock) 



No. 18. Black slate " , 



No. 19. Coal No. 5... 



------------..__........,.___.....,__. .......... O 



Total depth 249 i 



Dawson is 55 feet above the station at Eiverton, where the Kiver- 

 ton coal shaft is located, and as the depth of the Dawson shaft was 

 was not deep enough to allow for the average dip of the coal to the 



