SUBDIVISIONS Ol' MISSISSIIMM VAIMJOV C'AKHONIFEUOUS 



175 



Series. 



Oklalioman. 



Missounan. 



Des Moines. 



Terra NE. 



Not here differentiated , 



Cottonwood limestone. . 



Atchison shales 



Forhes limestones 



Platte shale? 



Plattsmouth limestones. 



I^awrence shales 



Stanton limestones 



Parkville shales 



Tola limestones 



Thayer shales 



Bethany limestones . . . . 



TllirKNKSS 

 IN FEET. 



Marais des Cygnes shales. 

 Henrietta limestones . . 

 Cherokee shales 



Mississippiail. 



Hiatus. 



Kaskaskia. . 

 Saint Louis 

 Augusta . . . , 

 Chouteau . . . 



10 



500 



25 



105 



30 



265 



35 



75 



30 



50 



75 



250 



50 



200 



275 

 300 

 250 

 100 



The Des Moines and Missourian series constitute what are called the 

 Coal Measures. 



In the Arkansas valley and Boston mountains the general section, as 

 given by Branner,* is apparently totally different : 



Coal Measures. 



Mississippian. 



Poteau beds 



Productive beds 



Barren beds (Lower Coal Measures] 

 Millstone grit 



3,500 



1,800 



18,480 



500 



Boston group 



Batesville sandstone, 

 Fayetteville shale. . . 

 Wyman sandstone .. 



Boone chert 



Saint Joe marble 



780 

 200 

 300 



10 

 370 



40 



Am. Jour. Sci. (4), vol. ii, 1896, p. 23.5. 



