14 MISSISSIPPIAN BRACHIOPODA 



Feet 

 4. Compact, much-fractured, gray limestone 12-18 



3. Thin band of hard, impure limestone, filled with Chonetes, 



often associated with a thin oolitic band i^-l 



2. Soft, friable, argillaceous sandstone, usually yellow, but 



locally harder and bluish, with a large fauna of which 

 Chonopectus fischeri is the most conspicuous species. 

 The Chonopectus sandstone 25 



1. Soft, blue, argillaceous shale (exposed) 60 



At Hannibal, Louisiana, and Clarksville, Missouri, the section is as fol- 

 lows: 



SECTIONS AT MISSOURI LOCALITIES 



Osage group. 



4. Burlington limestone. 



Kinderhook group. Feet 



3. Fine-grained, compact, buff limestone 10-15 



2. "Vermicular sandstone and shale" (Hannibal sandstone) 70 



1. Compact, blue-gray limestone with lithographic texture 



(Louisiana limestone) 60 



At Hamburg, Calhoun County, Illinois, the section is similar to that at 

 Louisiana, Missouri, except in the notable reduction in thickness of the 

 Louisiana limestone, and the introduction of an oolitic limestone above 

 the Louisiana. The section is as follows : 



SECTION AT HAMBURG, ILLINOIS 



Osage group. 



5. Burlington limestone. 



Kinderhook group. Feet 



4. "Vermicular sandstone and shale" (Hannibal sandstone 



and shale) , (?) 



3. White to yellow or flesh-colored oolitic limiestone, with in- 



terbedded layers of sandy shales (Hamburg oolite) . . . 1-15 



2. Brown, sandy shale 1-8 



1. Compact, gray limestone with lithographic texture 



(Louisiana limestone) 5 



In central Missouri the entire Kinderhook is represented in the Chou- 

 teau limestone, about 100 feet in thickness. 



In southwestern Missouri the Kinderhook section is made up of three 

 members, as follows : 



SECTION IN SOUTHWESTERN MISSOURI 



Osage group. 



4. Burlington limestone. 



Kinderhook group. Feet 



3. Buff-colored limestone (Pierson limestone) 30 



