BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 VOL. 3, PP. 283-300, FL. 9 JUNE 3, 1892 



. THE PRINCIPAL MISSISSIPPIAN * SECTION. 



BY CHARLES R. KEYES. 



{Presented before tin Society August 25, 1891.) 



( !( >NTENTS. 



Page 



Introductory Remarks 283 



Typical Sections along the Mississippi River 284 



The Kinderhook Beds 287 



I >efinition 287 



Louisiana Limestone 289 



Hannibal Shales 289 



Chouteau Limestone 290 



( >sage Limestones 2'.H) 



Definition and general Relations -"•" , 



Burlington Limestone 292 



Keokuk Limestone 292 



Warsaw Beds 293 



St. Louis Limestones 294 



Kaskaskia or "Chester" Beds 295 



Aux Vases Sandstone 295 



Kaskaskia Limestone and Shales 296 



Coal Measures 297 



Recapitulation 298 



Introductory Remarks. 



.More than half a century has passed since the rich and varied faunas 

 of the later Paleozoic rocks of the continental interior firsl began to attracl 



attention. From the beginning an exc lingly active and ever-growing 



interesl was taken in the various forms of ancient Life represented, and. 

 as a matter of consequence, the geological history of the region was 

 approached from the biological rather than the stratigraphical side. 



* The term Mississippi re used i tituto Cor "Ion i ncrally 



applied now to ci rti » I in the Mississippi vulley. The mime was originally suggested in this 



by Alexander Winn hoi I, and has recentlj mewh il i lified ind applied by II S. Wil 



Bull i - Gool -hi . no. 80, 1891, p. I 10 



WW ill i:. ii . .;,. \m Vol.. ; 1891 (.283 



