562 



APPENDIX, 



Section in Indian Territory. 1 



Names of Formations. 



Thickness 

 in Feet. 



Characteristics. 





' Summit removed by 

 erosion. 



Seminole conglom- 

 erate. 



50 + 



Conglomerate of white chert in brown sandy 

 matrix, succeeded by brown sandstone. 





Holdenville shale. 



260 



Blue and yellow clay shale, with thin siliceous 

 limestone- and sandstone-beds. 





Wewaka formation. 



700 



Massive brown friable sandstone, with soft, 

 thin limestone lentil in lower part. 





Wetumka shale. 



120 



Clay shale above, sandy shale and thin sand- 

 stone below. 





Calvin sandstone. 



145-240 



Thick-bedded and hard, friable, ferruginous, 

 and shaly towards the south. 



d 



Senora formation. 



140-485 



Brown sandstone, thick-bedded to shaly. 



Stuart shale. 



90-280 



Blue and black, with sandstone lentil. 



a 



Thurman sandstone. 



80-260 



Brown sandstone, shale, and cherty conglom- 

 erate. 



Boggy shale. 



2000-2600 



Shale, shaly sandstone, and brown sandstone. 

 Locally, thin siliceous limestone-beds, and 

 coal near the base. 





Savannah sandstone. 



750-1100 



Brown sandstone and shale. 





McAlester shale. 



1150-1500 



Shale, brown sandstone, and conglomerate of 

 white chert pebbles. 





Hartshorne sand- 

 stone. 



150-200 



Brown sandstone, varying to chert conglom- 

 erate. 





Atoka formation 

 (Chickahoc chert 

 lentil). 



3200 



Shale and brown sandstone, variable in thick- 

 ness, texture, and hardness. Lentil of chert 

 and limestone, and a conglomerate bed of 

 iron concretions. 





Wapanucka lime- 

 stone. 



100-150 



White oolitic and blue limestone, shale, and 

 locally cherty calcareous sandstone. 



i i 

 a. 3 



Caney shale. 



1500 



2. Blue shale with sandy lentils and ironstone 



concretions. 

 1. Black fissile shale, with dark-blue f ossifer- 

 ous limestone concretions. 



9 fl 



fc.g 1 



Woodford chert. 



600 



Thin-bedded chert and fissile black shale; blue 

 flint lentils at base. 



1 Above the Savannah sandstone the section is taken from the -Coalgate (I. T.) folio; remainder 

 from the Atoka folio. Taff, U. S. Geol. Surv. In the area covered by the Talequah folio, there 

 are unconformities between the Ordovician and the Silurian, the Silurian and the Devonian, the 

 Devonian and the Mississippian, and the Mississippian and the Pennsylvanian. 



