G96 J. H. GARDNER THE MID-CONTINENT OIL FIELDS 



GENERAL 8TRATIGRAPHIC SECTION IN SOUTHEASTERN OKLAHOMA, NORTH 

 OF ARBUCKLE MOUNTAINS 



The following general stratigraphic section in southeastern Oklahoma 

 is given in descending order : 



Loicer portion of Pennsylvanian. Feet 



1. Seminole conglomerate and Holdenville shale 250- 300 



2. Wewoka formation. Sandstone and shale with. beds of 



thin limestone 500- 800 



3. Wetumka shale 120 



4. Calvin sandstone. Approximate horizon of Oswego lime- 



stone in north area 140- 240 



5. Senora sandstone 140- 485 



6. Stuart shale 90- 280 



7. Thurman sandstone 80- 260 



8. Boggy shale with beds of thin sandstone; limestone and 



thin irregular coal at base 2,000-2,600 



9. Savanna sandstone; massive sandstone strata with beds 



of shale (horizon of Bartlesville sand) 1,000 



10. McAlester shale. Includes strata of sandstone. Coal 



beds of the McAlester-Coalgate region (Oklahoma coal 



field) 1,800-2,000 



11. Hartshorne sandstone. 150 



12. Atoka formation. Massive beds of sandstone with alter- 



nating beds of shale 3,100 



13. Wapanucka limestone 100 



Mississippian series. 



1. Oaney shale 1,500 



Devonian system. 



1. Woodford chert 600 



Ordovician and Silurian systems. 



Sandstone, shale, and limestone 5,000-7,000 



Gamhrian system. 



Reagan sandstone 100 



(Unconformity.) 

 Pre-Caml)rian granites. 



South of the Arbuckle Mountains both the Permian and Cretaceous 

 show strong angular and erosional unconformities with lower rocks, so 

 that a considerable portion of the original beds are missing. 



The following section applies to that region: 



GENERAL STRATIGRAPHIC SECTION SOUTH OF THE ARBUCKLE MOUNTAINS 



IN OKLAHOMA 



Lower Cretaceous system (Comanche series). Feet 



1. Silo sandstone 200 



2. Pennington limestone 10- 15 



