178 GEOLOGY OF ILLINOIS. 



Ft. In. 



12. Similar to No. 11, with fossils 13 



13. Bituminous shale and pyritiferous limestone 9 



14. Gray pyritiferous sandstone 30 to 40 



15. Shale, with fucoids - 40 



16. Chertybeds - 4 



17. Limestone 4 



18. Calcareous and bituminous shale 16 



19. Nelson's coal, No. 16 16 



20. Fire-clay \ 4n 



21. Shale? $ 



22. Sandstone 30 



23. Coal No. 15, or Shelby coal 1 



24 . Fire-clay 3 



25. Nodular limestone 2 



The rocks on Salt creek include tbe upper part of the section Nos. 1 

 to 11, inclusive, and are more particularly described as follows : 



Ft. 



1. Just south of Effingham, the road passes over irregular beds of mostly .hard gray sandstone, 



with some shaly beds 15 to 20 



2. In a ravine lower down the branch, sandy shale, with coal smut 6 



3. At the quarry below, yellow and brown sandstone, with many plants near the upper part, 



including Catamites, etc ;J0 



4. Dark-gray pyritiferous sandy shale and sandstone, probably 12 or 15 feet in sight 8 



5. Up a branch to the west, bituminous shale, with thin coal lamina;, contains a calcareo-pyri- 



tiferous bed of sept aria, changing to a broad, flat, 5-inch bed of rock, perpendicularly 

 jointed, forming rhomboidal blocks; it contains a few very pretty fossils, PUurotomaria 

 sphwndata, Spirifer piano -eonvexus, Iihynchonella Osagensis, Nautilus occidentalism and 

 Hautilits /errata ? 1 6 



6. Dark-olive shale and clay 4 



7. Dark ash-brown shaly aud nodular limestone, abounding in a Myalina, like ilf. sub-quad rata, 



narrow and regularly rounded at the anterior margin ; also contains Aviculopecten occiden- 

 tulis, Bellerophon Montfortianus, Edmondia* a small Pleurotomaria, Leda (coarsely stri- 

 ated), Macrodon (like M. carbonaria), and a small univalve 1£ 



8. Black and olivu shale 1 



9 . Olive clay shale 4 



10. Rough thinly bedded gray sandstone and sandy shale 3 



At a quarry half a mile further down the creek, Nos. 4 and 5 crop 

 out with the rocks below to No. 11 : 



Ft. 



11. Hard blue and gray even bedded sandstone 6 



Two miles southwest, on a western branch of Salt creek : 



12. Mostly dark-o'ive or chocolate-colored sandy and clay shale 17 



13. Dark shale, with two 1-inch even beds of gray limestone, abounding in remains of fossils, 



including jRcmipronites crassus, Spirifer -piano -eonvexus, Chonetcs Flemingii, an Edmondia, 



a Trilobite, crinoid stems and plates, Stenopora lepidodendroides, etc 1 



14. Dark o ive and slate-co'ored shales 4 



15. Bituminous coal (No. 17) _. 0& 



16. Light dove-colored fire-clay, nodules in the middle 5 



17. Sandy shale, with brown nodules 2 



18. Down the same branch, and on Salt creek, are occasional outcrops of thick and thin bedded 



gray, buff and drab sandstone and shale, No. 10 of the county section; in all about 20 



19. On Big Salt creek, half a mile above its junction with Little Salt, are twenty feet of clay 



shale; near the middle are two fossiliferous beds of carbonate of irou, with calcareo- 

 argillaceous shales between, and abounding in very pretty fossils, viz: Leda bella-striata, 

 Astartella vera, Nuculu ventricosa, Spirifer plano-convexus, Chonetes Flemingii, Myalina 

 sub-quadrata, Macrocheilus inhabilis, Pleurotomaria Gr ay villa nsis, Bellerophon Montforti- 

 anus, Bellerophon carbonarius, Bellerophon Sp J and Orthoceras cnbrosum ? 



