180 GEOLOGY OF ILLINOIS. 



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4. Compact dnll-ash pyritiferous limestone with fossils. Producing (small sp.) Sp. piano- 



convexus, Leda arata, Memipronit-es crassus, Bellerophon Montfortianus, Euomphalus 



sub-rugosus 1 



5. Blue shales, fossils as above 5 



6 . A sh-brown shales 1 



7. Coarse ash-blue pyritiferous limestone, contains Prod. Pratienianus 4 



8. Shales 4 



9 . Bituminous shales 6 



10 . Ash-blue pyritiferous limestone 1 



11. Shales, thin seams of coal and some bituminous sbale 2 



12. Gray pyritiferous sandstone 15 



A specimen collected from a portion of the last is of very even thick- 

 ness and marked with fine ripple-like striae. The rocks here have a 

 local dip of 5° to 10° south, 25° west. 



One mile west we have : 



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1. Bituminous shale with, black concretionary limestone in the upper part 3 



2. Dark-blue limestone mottled withblack fucoidal markings, contains some beautiful fossils, 



including Productus Boonensis, P. Pratienianus, P. longispimis, P. costatus, Phynchonella 

 osagensis, Pctzia punctulifera, Jffemipronites crassus, Schizodus, (like S. Rossicus) Edmondia, 

 Orthoceras cribrosum, Bellerophon per-caHnata, Nautilus, (like N. elliptica,) Euomphalus sub- 

 rugosus, Macrocheilus, (like M. Newberryi,) and one like M. ventri-cosus 



3. Blue and bituminous shales .' 10 



The following is the section on Shoal creek: 



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1 . Ash-blue clay shale 15 



2. Dark-gray shaly limestone 2 



3. Bluish-drab limestone with the following fossils : Nautilus occidentalism Nautilus, 



Prod. semi-reticulatus, P. longispimis, P. scabriculus ? P. costatus, Ghonetes Flemingii, 

 Athyris subtilita, Spirifer plano-convexus, Hemiproniies crassus, Phynchonella osagensis. 

 Tereb-ratula bovidens, and Orthoceras cribrosum 1 3 



4 . Dark ash-blue clay shales 10 



5. Bi tumiuous shales 4£ 



6. Blue limestone, lower part shelly and contains some fossils, Prod. rratlenianus, P. semi- 



reticulatus, Spirifer cameratus, and Myalina sub- quadrata 2 



7 . Bitum inons coal 6 



8. Fireclay 3 



9. Sandstone 25 



10. Red shale 4 



1 1 . Hard gray sandstone 6 



12. Sandy and clay shales with some nodules 18 



On the head of east fork of Shoal creek, one mile north-east of last 

 section : 



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1. Dark ash clay shales 2 



2 . Brown calcareo-arenaceous bed 1 



3. Semi-bituminous shale, contains Bellerophon 2 



4 Dark blackish bituminous limestone G 



5 . Dark ash fire-clay 2 



6 . Hard drab sandstone 



The following on Limestone creek : 



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1 . Sandy shale 2£ 



2 . Hard drab sandstone 2£ 



3. Buff-drab and olive clay shales 4 



4 . Ked clay shales 1£ 



