536 



SYDNEY H. BALL 



TOPOGRAPHY. 



The northern flank of the Ozark uphft is a plain sloping gently 

 to the north. Its level surface is due to Tertiary peneplanation.^ 

 In the vicinity of the major streams the plain is intimately dissected 

 and the topography is mature. 



STRATIGRAPHY. 



The stratigraphy is summarized in the following table: 



Recent. Osage alluvium. 



Pleistocene. Glacial bowlders in Osage alluvium. 



Unconformity. 

 Graydon sandstone. Massive, medium-grained sandstone, more 

 or less conglomeratic. Lithologically scarcely to be distin- 

 guished from the Pacific sandstone. 0-75 feet thick. 

 Coal-Measure shale. Shale, more or less conglomeratic, bitu- 

 Pennsylvanian -^ minous and cannel coal and limestone. 0-156 feet thick. 



Saline Creek cave-conglomerate. Unassorted conglomerate 

 composed of arenaceous or calcareous shale containing peb- 

 bles and blocks of older formations. Grades into Coal- 

 [ Measure shale. 0-60 feet thick. 



Unconformity. 

 I Burlington limestone. White, coarse-grained, fossiliferous lime- 



! stone. 0-108 feet thick. 

 Mississippian -\ 



Chouteau limestone. 

 (^ thick. 



Buff, argillaceous limestone. 0-85 feet 



Unconformity. 

 Undifferen- T Pacific sandstone. 



tiated ' J^^^rson City formation. 



Cambro-Or-1 St. Elizabeth formation, 

 dovician ' Gasconade Hmestone. 

 iGunter sandstone. 



Unconformity. 

 Probable 



Dolomites, sandstones, and shales. 

 Referred to below as "Cam- 

 bro-Silurian." 



Cambrian \ 



Proctor limestone. 



J 



It is the purpose here to describe the sequence of events con- 

 nected with the deposition of the Carboniferous, and particularly the 

 Pennsylvanian, formations, rather than the detailed stratigraphy.^ 



1 Marbut, Missouri Geological Survey, Vol. X, p. 27. 



2 For stratigraphy see Ball and Smith, "The Geology of Miller Co.," Missouri 

 Geological Survey, 2d ser., Vol. I, pp. 23-122. 



