286 C. R. KEYES — THE PRINCIPAL MISSISSIPPIAN SECTION. 



Louis limestone reposing unconformably upon the brown massive layer 

 number 6, and with the Coal Measures, number 8, superimposed uncon- 

 formably upon it. 



Warsaw Section. 



Feet. 



6. Ash-colored brecciated limestone , 25 



5. Buff calcareous gritstone, fossiliferous 8 



4. Blue clay-shale with thin bands of impure limestone 2.3 



3. Compact buff limestone with encrinital layer above 



2. Blue clay-shales ; " geode-bed " 30 



1. Thinly bedded encrinital limestone, highly fossiliferous ; exposed 15 



Numbers 1 to 5 are regarded as Keokuk. Of these numbers 3, 4 and 5 

 are the typical Warsaw of Hall. Number 6 belongs to the St. Louis. 



Louisiana Exposures. 



Feet. 



15. Soil 2 



14. Compact yet thinly bedded encrinital limestone, with considerable gray 



and brown chert 50 



13. Massive, white encrinital limestone, coarse grained 12 



12. Brown encrinital limestone with irregular chert bands and thin clay 



seams occasionally 20 



11. Very heavily bedded white encrinital limestone 11 



10. Brown encrinital limestone, somewhat sandy in places ; earthy and dis- 

 integrating on exposure to the weather 15 



9. Fine grained buff limestone 15 



8. Brown sandy shales 12 



7. Green clay-shales 60 



6. Thinly bedded compact buff limestone, in layers from 4 to 6 inches in 



thickness, with a thin and sandy highly fossiliferous seam at the base. 50 



5. Blue clay-shales 2 



4. Black fissile shale 4 



.">. Compact, massive buff limestone 10 



2. ( iray oolitic limestone 5 



1. Blue clayey shales with numerous thin limestone bands, rich in fossils; 



exposed 60 



All above number 9 belongs to the Burlington limestone, and the beds 

 from numbers G to 9, inclusive, to the Kinderhook. Number 9 is the 

 Chouteau limestone of Swallow ; numbers 7 and 8 the Vermicular sand- 

 stone and shales of the same author; and number 5 is the Lithographic 



limestone. 



St. Louis Section. 



Feet. 



blue and gray limestone, compact, rather heavily bedded, more or less highly 



fossiliferous, with thin marly partings; exposed to water level L25 



