THE PENNSYLVANIAN PERIOD. 



561 



Section in Northern Missouri. 



Names of Formations. 

















3 CO 



5.8 







U 



CO 05 



2 



*5 



gCB 



a 





> 









>, 



05 



GO 



:a » 



rt 



1 



s Mo 

 Serie 





05 





Q 





I 



(Not subdivided) 



Pleasonton shales. . . 

 Henrietta formation. 

 Cherokee shales. . . . 



Unconformity. 

 Discontinuity. 



.5 f Kaskaskia limestone . . 



co ■{ 



j^ [ Aux Vases sandstone. . . 

 oa r St. Genevieve limestone 

 3 -J St. Louis limestone. . . . 



3 [ Warsaw formation 



fcJO 



< 



V ° 

 q o 



Keokuk formation. 



Thickness 

 in Feet. 



Discontinuity. 



Upper Burlington lime- 

 stone 



Lower Burlington lime- 

 stone 



(Unnamed) 



M 



Hannibal shales. . . . 

 Louisiana limestone. 



Devonian. 



1000 



150 



90 



100-400 



150 



90 



100 



200 



80 



50 



150 



80-100 



50 



50 



9 



72 

 48 



Charac teristic s . 



Shales and limestones, the former pre- 

 dominant. 



Shale and sandstone. 



Shale and limestone. 



Shale and sandstone. 



Shale and sandstone; occasional thin 

 beds of concretionary limestone, and 

 one or two thin beds of coal. 



Shales, resistant limestones, sandstones, 

 and clays; one or two beds of coal of 

 commercial importance. 



Conglomerate at the base, grading into 

 sandstone above and this into shale; 

 coal-beds and occasional beds of 

 limestone of limited extent. 



Thin beds of gray limestone and bluish 



marl, rich in fossils. 

 Fine-grained ferruginous. 

 Thick-bedded. 



Heavy-bedded, gray, oolitic at base. 

 Gray and bluish-gray limestone; fossils 



numerous. 

 Limestone, massive, compact, white in 



color and highly fossiliferous. 



Thin-bedded at the top, more massive, 

 encrinital below; cherty. 



White, bluish or brown in color; heavy- 

 bedded; largely encrinital. 



Yellow, massive or thick-bedded, rather 

 soft, fine-grained limestone. 2 



Green, sandy above; brown, sandy, 

 grading into soft sandstone. 



Buff to gray, compact, fine-grained in 

 thin layers; similar to lithographic 

 stone in texture. 



1 Pennsylvanian section is generalized for the northern part of the state; Mar- 

 but, Missouri, Geol. Surv., Vol. XII, pp. 267-269. The Mississippian section, above 

 the Keokuk, is for St. Genevieve Co.; Shumard, Geol. Surv. of Missouri, 1855-71, 

 pp. 292-293, and Keyes, Missouri, GeoL Surv., Vol. IV, p. 48. Below the Keokuk, 

 the section is that exposed at Louisiana, Mo.; Proc. Iowa Acad. Sci., 1896, Vol. IV, 

 pp. 26-27. 



2 This bed has been correlated with the Chouteau limestone which is well 

 developed in central and southwestern Missouri, but this correlation is probably 

 incorrect. 



