THE OKLAHOMA nni^LDS 69S 



Oklahoma 



PRODUCTIVITY OF THE FIELD 



Eecently discovered fields have given fame to Oklahoma the world over 

 for its enormous production of high-grade petroleum. 



BTRATIQRAPHY 



The Pennsylvanian series furnishes the main supply of oil-producing 

 sandstones in Oklahoma^ as shown in the foUomng general stratigraphic 

 section of rocks (see also figure 3). 



GENERAL STRATIGRAPHIC SECTION IN MAIN OIL AND GAS DISTRICT OF 

 NORTHERN OKLAHOMA 



Cretaceous series (see section further on). 



Permian series. Peet 



1. Red and gray sandstone, clay-iron conglomerate, red and 



vari-colored shale ; thin beds of concretionary limestone 

 near base; beds of gypsum and salt in upper portion. 

 Quartermaster, Greer, Woodward, Blaine, and upper 

 portions of Enid formations ; latter includes the Marion 

 limestone of Kansas which outcrops around Blackwell, 

 Oklahoma 1,200-2,000 



2. Fort Riley limestone and other beds of thin limestone, 



sandstone, and shale down to the Neva limestone, in- 

 clusive. Contains near base the shallow gas sands at 

 Blackwell, Billings, and Garber 500- 600 



3. Elmdale formation; included in Permian of Kansas by 



Beede, but of uncertain occurrence in Oklahoma. 

 Pennsylvanian series. 

 Ralston group : 



Includes limestone and shale beds of Kansas section from 

 Americus limestone down to Lecompton limestone, in- 

 clusive. In Oklahoma, however, consists of red and 

 gray sandstone, red shale, and beds of thin limestone. 

 Contains the Garber oil sand. 



1. Upper division down to Pawhuska limestone, inclusive . . 650 



2. Lower division down to top Elgin sandstone 140 



Sapulpa group : 



1. Elgin sandstone. Probable horizon of shallow oil sand in 



the Newkirk field and at Ponca City 20- 150 



2. Oread limestone 0- 20 



3. Buxton sandstone and shale. Horizon of main oil sand 



at Ponca City and gas sand at Myers 700-1,000 



4. Avant limestone 0- 10 



5. Ramona formation. Sandstone, shale, and thin limestone 



beds. Includes Lost City limestone and the Mussel man 



oil sands of the Cushing-Cleveland areas 300- 400 



