12 ECONOMICAL GEOLOGY. 



Feet. 



No. 1:5. Shale and shite 13 



No. 14. Hard sandstone, (base of Coal Measures) ^ 



No. 15. Shale n 



No. Hi. Hard silieious stone 



No. 17. S;!iidy shale 7 



N...IS. Shite 10 



No. 19. Hard limestone 8 



No.20. Shale - 



No. 21. Limestone and shale 1 



No. 22. Shale, very hard 31 



No.23. Sulphuret of iron 1 



No.24. Limestone and shale 2 



No. 25. Limestone c 



No. 26. Shale 1 



No. 27. Hard limestone 21 



Total depth 312 



All the beds below No. 14 of the foregoing section probably belong 

 to the St. Louis and Keokuk divisions of the Lower Carboniferous 

 series, and hence are below the horizon of any known coal. 



At Roodhouse, about four miles southwest of Manchester, a shaft 

 was sunk for coal, and the lower seam was found to be 2 feet 4 

 inches in thickness, with a good roof of black slate. The beds passed 

 through, in sinking the shaft, were the following: 



Ft. In. 



Soil, clay and gravel, (drift) 75 



Blue and ash-colored clay shale 15 



Black slate 1 foot to 1 3 



Coal .". 2 4 



Fire-clay and clay shale 18 



A boring made here, struck the St. Louis limestone at a depth of 

 about fifty feet below the coal. The roof of the Roodhouse coal is a 

 hard black shale or slate filled with nodules of sulphuret of iron, which 

 makes a permanent and substantial roof. The under clay seems to 

 be of a good quality, and similar to that so extensively used at 

 Whitehall for fire-brick and pottery. In Scott county, and in the cent- 

 ral and western portions of Greene and Jersey, the two lower coals, 

 Nos. 1 and 2 of the general section, are the only ones likely to oc- 

 cur ; but on the extreme eastern borders of the last named counties, 

 coals 5 and 6 are to be found on Hodge's creek, near the Greene 

 county line, and a mile and a half west of Brighton, near the eastern 

 border of Jersey county. 



At Gillespie, in Macoupin county, a shaft has been sunk during 

 the past year by B. L. Dorsey & Son, for the details of which I am 

 indebted to Mr. Alexander Butters. Coal No. 5 was found here at 

 the depth of about 365 feet, passing the following beds : 



