48 GBOLOaiCAL FORMATIONS 



VI. Sainte Genevieve to Sainte Mary. 



8. Soil 3 



7. .Sandstone, soft, yellow, ferruginous ( exposed ) 15 



6. Clay-shale and heavily bedded blue limestone 125 



5. Sandstone, yellowish (Aux Vases river ) 70 



4. Limestone, bluish, thinly bedded ( Sainte Genevieve) 45 



3. Limestone, rather heavily bedded, blue and ash-colored, with 

 marly partings, showing cross-bedding in places; oolitic and 



cherty locally 135 



2. Oolite, white, fossiliferous 15 



1. Limestone, massive, compact, white in color and highly fossilif- 

 erous (exposed) 50 



No. 1 is probably upper Keokuk ; i^os. 2 to 4 belong to the 

 Saint Louis group ; No. 6 is the Kaskaskia. No. 7 is the basal 

 sandstone of the Coal Measures. 



VII. Chester Section. 



Feet. 



8. Sandstone, ferruginous, with pJant remains ( exposed ) 25 



7. Shale, green and blue, with occasional limestone bands ID 



6. Limestone, gray, more or less nodular and impure 45 



5. Shale, green and blue, with thin limestone layers, highly fossil- 

 iferous in places 45 



4. Limestone, heavily bedded, compact, encrinital, with clay part- 

 ings 3 



3. Shale, drab, fossiliferous, with thin calcareous seams 4 



2. Limestone, dark drab, compact 4 



1. Limestone, heavily bedded, blue and gray ( above water level ) . . 75 



KINDERHOOK BEDS. 



Definition — There seems to be a general unanimity of opin- 

 ion as to the propriety of regarding as a distinct subdivision the 

 Lower Carboniferous rocks of the Mississippi basin below the 

 Burlington limestone. The upper line of demarkation is easily 

 recognizable throughout its whole geographic extent. Its 

 lower limit, however, has not been made out satisfactorily over 

 the entire area of its occurrence ; but in many places the group 

 of strata is known to rest on the " black shale " so well de- 

 veloped in Tennessee, and generally regarded as Devonian age. 

 For the groups of the beds in question, or parts of the group^ 

 various names have been given. But their historical consider- 

 ation need not be dwelt upon at length here. Whatever may 

 be, eventually, the most appropriate term to apply to this sec- 



