COAL MEASURES. 19 



Ft. In. 



No. 63. Coal 6 



No. 64. Blue and gray shales 14 5 



No. 65. Marly sandstone 1 6 



No. 66. Calcareous shale 5 



No. 67. Sandstone 15 



No, 68. Grayslate 5 9 



No. 69. Bituminous shale 2 3 



No. 70. Coal 3 6 



No. 71. Fire-clay 2 



Total depth 608 9 



No. 22 is probably the Carlinville limestone, and No. 35 the rep- 

 resentative of No. 8 coal, and beyond this the strata cannot be 

 positively identified with those occurring at other localities in the 

 adjacent portions of the State. 



In the Niantic shaft, coal No. 5 was found at the depth of about 

 350 feet. The seam was there five and a half feet in thickness, 

 overlaid by three feet of black shale. The following record of the 

 shaft was furnished by Mr. W. W. Conard, under whose superin- 

 tendence the work was done : 



Ft. In. 



No. 1. Soil and brown clay 11 



No. 2. Sand and gravel 4 



No. 3. Gravelly hard-pan 25 



No. 4. Blue hard-pan 10 



No. 5. Soft clay 15 



No. 6. Gray hard-pan 10 



No. 7. Soft brown clay 7 



No. 8. Limestone... 10 



No. 9. Blue flinty rock 2 



No. 10. Black slate 3 



No. 11. Fire-clay 6 



No. 12. Limestone 10 



No. 13. Blue and gray shale 7 



No. 14. Black shale 1 



No. 15. Coal No. 9 ." 2 



No. 16. Fire-clay . 1 



No. 17. Nodular limestone . 5 



No. 18. Clay shale 5 



No. 19. Soft blue sandstone 16 



No. 20. Gray shale 42 



No. 21. Coal No. 8 1 3 



No. 22. Fire-clay ;. 2 6 



No. 23. Sandstone 10 



No. 24. Gray shale 45 



No. 25. Hard flinty rock 10 



No. 26. Black shale 3 



No. 27. Fire-clay 9 



No. 28. Blue and red shales 15 



No. 29. Black slate 5 



No. 30. CoalNo.7 1 3 



No. 31. Fire-clay... . 4 6 



