4 COAL MEASURES. 



Ft. In. 



No. 38. Calcareo-bituminons shale, passing looally into an argillaceous limestone abounding 



in fussils, among which the following are the most common : Leda bclla- striata, 

 Nuculu ventricosa, AstarUlla vera, A. varica, Bcllerophon carbonarius, B. Montforli- 

 amis, B. per-carinatus, 2£acrocheilus inkabilis, M. primigenius, 21. vcntricosus, 

 Pleurotovxaria sphcerulata, P. GrayviUensis, Productus longispinus, P. Nebrascensis, 

 P. Frattenianus, Phillipsia Sanganwensis, P. scitula, Pohjphemopsis per-aeuta, 

 Orthoceras Eushensis, Zeacrinus ? mucrospinus, Erisocrinus typicus, Lophophylhvm 



proliferum, etc 2 to 3 



No. 37. Coal, No. 8 1 to 2 



No. 36. Dark ash-gray fire-clay 2 to 3 



No. 35. Nodular shale passing locally into a hard silicious limestone 3 to 4 



No. 34. Sandy shales and sandstone 40 to 75 



No. 33. Dark ash-gray silicious limestone containing Atkyris subtilita. Spirifer camera-tits, 



Chonetes mesoloba, joints of Crinoidea, etc lto 7 



No. 32. Bituminous shale 1 to 3 



No. 31. Coal, No. 7 2 to 9 



No. 30. Fire-clay 2 to 3 



No. 29. Sandstone and sandy-shale 30 to 50 



No. 28. Gray argillaceous limestone, with the Fusulina figured in toI. 5, pi. 26, fig. 8. It is 

 associated in Fultoacounty with llhy'nchoneUa Osagensis, Spirifcrina Kentuekensis 



and Hemipronites crassus 3 



No. 27. Laminated bituminous shale, with Lingida umbonata, and Cardinia ? fragilis 2 to 4 



No. 26. Coal, No. 6 1£ to 5 



No. 25. Fireclay 1 to 3 



No. 24. Sandstones and shales 25 to 75 



No. 23. Hard black shale, with concretions of limestone containing numerous fossils, among 



which are Productus muricatus, Clinopistha radiata, Nautilus, Orthoceras, etc.1 to 5 



No. 22. Coal, No.5 4 to 7 



No. 21. Fire-clay 1 to 3 



Ne. 20. Sandstone and sandy shale 30 to 75 



No. 19. Bituminous shale and argillaceous limestone 2 to 4 



No. 18. Coal, No. 4 2 to 4 



No. 17. Fire-clay and clay shale 2 to 10 



No. 16. Sandstone and sandy shale 50 to 75 



No. 15. Bituminous shale passing locally into dark blue Iimestoneand concretions of septaria 

 filled with fossils, Cardiomorpha 2£issouriensis, Discina nitida, Productus murica- 

 tus, P. Prattenianus, with two or three small species of Goniatites and Nautili. . 3 to 6 



No. 14. Coal, No. 3 2 to 4 



No. 13. Fireclay 1 to 3 



No. 12. Hard, tough steel-gray limestone weathering to a rusty-brown color, and containing 



Spirifer cameratus, joints of Crinoidea, etc H to 3 



No. 11. Sandstone and silicious shale 25 to 30 



No. 10. Blue clay shale filled with fossil plants. At Hurphysboro, Colchester and on ilazon 

 creek, in Grundy county, this sha^e contains concretions of iron ore inclosing 



fossil plants, insects, Crustacea, etc 2 to 3 



No. 9. Coal, No. 2 2 to 5 



No. 8. Light gray fire-clay 2 to 3 



No. 7. Sandstone and silicions shales, about fifty feet in thickness, on the northern and 

 western borders of the coal field, but in Gallatin county attaining a thickness of 



about one hundred and forty feet, with some thin seams of coal 50 to 140 



No. 6. Dark argillaceous limestone, sometimes highly silicious, and in Rock Island county 

 associated with a band of dark steel-gray chert, from six inches to a foot or more 

 in thickness. At some localities, as near Seaville, in Fulton county, it contains 

 numerous fossils, among which are Spirifer cameratus, S. lineatus, S. opimus, 

 Nautilus occidentalis, Productus Prattenianus, P.costatus^ P. nanus, P.punctatus, 

 MacrocheUus, etc. This limestone is replaced in Southern Illinois by silicious 



shales - 3 to 8 



No. 5. Bituminous and silicious shales forming the roof of Coal No. 1. In Gallatin county 

 this shale is generally silicious, but in the northern portion of the State it is 

 usually bituminons, and contains Spirifer cameratus, Athyris subtilita, Auiculopec- 

 ten, Orthoceras, etc 3 to 3 



