CHOUTEAU LIMESTONE 



115 



replaced by limestone. In other parts of Missouri he clearly con- 

 siders the Chouteau limestone as the upper member of his 

 ' ' Chumung ' ' group. 



GEOLOGIC CROSS-SECTION IN MISSOURI BETWEEN SEDALIA AND HANNIBAL 



Fig. 7. 



Two geological cross-sections constructed at right angles to 

 each other and intersecting at Chouteau Springs quickly set to 

 rights all the conflicting notions of the past fifty years concern- 

 ing the stratigraphic relations of the Chouteau limestone. One 

 cross-section extends from Hannibal (near Kinderhook, Illinois) 

 on the Mississippi river, to Sedalia, in Pettis county, a distance of 

 one hundred thirty miles (figure 7). The other section, fifty 



Fig. 8 — Chouteau terrane at type locality. 



miles in length, traverses Saline, Cooper and Morgan counties, 

 from the town of Marshall to thai of Versailles (figure 8). Both 

 sections are checked at frequenl intervals by rock exposures and 

 bv well records. 



