56 GEOLOGY OF ILLINOIS. 



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No. 8. Black shale— No. 12 6 



No. 9. Coal— No. 12 6 



No. 10. Blue and green clay shale 2 to 3 



No. 11. Massive gray sandstone 18 to 20 



No. 12. Clay shale 15 to 18 



No. 13. Black laminated shale 2 to 3 



No. 14. Dark shaly limestone 1 



No. 15. Coal— No. 11 - • 10 



No. 16. Clay shale 3 to 4 



No. 17. Hard, nodular, dove-colored limestone 2 



No. 18. Soft shales 15 to 20 



No. 10. Hard, bituminous limestone 1 to 3 



No. 20. Coal No. 10 1 



No. 21. Sandy shale, and saDdstone in the river bed 8 



The limestone No. 19 of the above section I believe to be identical 

 ■with that at Reel's place, and the sandy shale and sandstone in the 

 river bed at Rochester mills to be the upper part of the Hanging-rock 

 sandstone, and the sandstone at Mount Cartuel is probably the equiva- 

 lent of No. 11 of the foregoing section. The upper coal on Coffee creek, 

 No. 1 of the above section, is probably the same formerly worked by 

 Mr. Simonds and others south-west of Mount Carmel, and is either a 

 merely local seam, or a division of No. 12, as there is a heavy bed of 

 sandstone, usually from sixty to eighty feet in thickness, intervening 

 between coals 12 and 13, of which there was no trace here, the covered 

 space represented by No. 2 of the section not exceeding 8 to 10 feet in 

 thickness. It is possible that the outcrop of No. 1, which was only 

 some two or three hundred yards from the outcrop of Nos. 7, S and 9, 

 may be only a thickening and reappearing of the same seam at a little 

 higher level. The outcrop at the highest exposure was in the bed of 

 the creek, and no roof but sand and gravel was found above the coal. 

 The shaly brown limestone No. 4 of this section contained a few fossils, 

 among which I noticed Spirifer cameratus, Lophophylhnn , proliferum and 

 joints of Crinoidce. The hard, dove-colored limestone contained numer- 

 ous examples of Productus Prattenianus, Aviculopecten Clevelandicus, 

 and a small branching coral. 



The old coal shaft on Mr. Seconds' place, about three miles south- 

 west of Mount Carmel, has been abandoned for some time, and the 

 sides have fallen in, so that nothing could be learned when I was 

 there in regard to the thickness or quality of the coal, except from those 

 who had worked in the mine when it was in operation. The seam is 

 said to average about three feet in thickness, and lays from 30 to 35 

 feet below the surface. 



Section of Simonds' coal shaft : 



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Drift clay and soil 5 6 



Argillaceous shale '. 30 



Limestone 6 



Coal 3 



