26 ECONOMICAL GEOLOGY. 



is hidden in its southeastern extension by the superincumbent 

 deposits of drift material. The following is a copy of the record 

 of this boring: 



Ft. In. 



1. Superficial deposits 186 



2. Sandy shale 7 



3. Sandstone 14 



4. Green shale 20 7 



5. Hard rock 4 



6. Sandstone 46 1 



7. Conglomerate 6 6 



8. Sandstone with blue bands 14 



9. Shale , H8 1 



10. Soapstone (clay shale) 15 



11. Sandstone 20 



12. Sandy shale 10 



13. Clayshale ." 42 6 



14. Hard rock 6 



15. Clayshale 9 



16. Slate and shale 101 6 



17. Blackshale 12 6 



18. Limestone 140 



19. White sandstone 20 



Total depth 792 9 



There is probably a considerable area along the line of the 

 above mentioned axis extending through the counties of Livings- 

 ton, Ford, Champaign and Douglas, that is colored as coal 

 measures on the map, where no valuable deposit of coal will be 

 found, such deposits having been removed by erosion if they 

 formerly existed over this axis as seems probable, but the 

 boundaries and extent of this barren area, can only be deter- 

 mined by the drill, or artificial excavations, as there are no 

 natural outcrops that will help to define its extent. There are 

 hundreds of square miles in this portion of the state, where 

 there are no natural exposures of the bed rock, and consequently 

 no definite knowledge in regard to the character of the under- 

 lying formations can be obtained by surface explorations, the 

 banks of the water courses revealing nothing but the upper 

 portion of the drift deposits. 



Sidney in Champaign county, is about fifteen miles north, and 

 twelve miles east of Tuscola, and is probably on the eastern 

 side of the axis. In the published record of the boring there, 

 four coal seams were reported in a total depth of 256 feet, the 

 lower seam six feet in thickness, and the others ten, twenty and 



