STRATIGRAPHIC SUMMARY. 633 



V. The Mississippic System. 



This is typically developed in the Mississippi valley, where the 

 following divisions are recognized :^^ 



Upper Mississippic or Chester group (Chesteran). 

 Kaskaskia limestone. 



Birdsville formation. 



Tribune limestone. 

 Cypress sandstone. 

 St. Genevieve limestone. 



Ohara limestone. 



Rosiclare sandstone. 



Fredonia oolitic limestone. 



Middle Mississippic or Meramec group (Meramecan). 

 St. Louis limestone. 

 Spergen limestone. 



Lower Mississippic (Waverlyan). 

 Osage group (Osagian). 



Warsaw shales and limestones. 



Keokuk limestones. 



Burlington limestones. 

 Kinderhook series (Chouteauan). 



Chouteau limestone. 



Hannibal shales. 



Louisiana limestone. 



In the lower part of the Kinderhook, the Louisiana limestone is 

 in part represented by shales and sandstones; the succession in 

 descending order below the Burlington in southern Iowa is as 

 follows: 7, Buff limestone; 6, Oohtic bed; 5, Upper Yellow sand- 

 stone; 4, Louisiana Hmestone; 3, Chonetes bed; 2, Chonopectus 

 sandstone ; i, Lower blue clay.-^ 



In Calhoun County, Illinois, the series below the Burlington 

 comprises : Vermicular sandstone, Blue shale, Hamburg limestone 

 and shale, Brown sandy shales, Louisiana limestone. Soft green 

 shale. This rests disconformably upon the Devonic. In Jefferson 

 County, Missouri, the section below the Burlington comprises : 



=^« Modified after E. O. Ulrich, U. S. G. S., Prof. Paper 2,6, p. 24. 

 " Weller, " Kinderhook Faunal Studies." 



