376 DRAKE — THE GEOLOGY OF INDIAN TERRITORY. [Sept. 3. 



A section across the group along a line from Muscogee, througli 

 Ridge and Sapulpa to Gushing, is approximately as follows : 



FEET. INCHES. 



1. Coal (Mayberry coal?) 2 



2. Clay shale 100 



3. Sandstone 10 



4. Shale 50 



5. Thin strata of light gray, arenaceous, 



limestone and calcareous sandstone 

 interstratified with gray calcareous 

 clay shale 25 



6. Gray clay shale 100 



7. Friable, black, carbonaceous, clay 

 shale, which contains near the top 

 some limestone nodules one and a 

 half feet in diameter. These lime- 

 stone nodules are carbonaceous and 

 black, but weather to a white 

 color and contain numerous calcite 

 seams running through the nodules. . 50 



8. Sandstone 25 



9. Clay shale 100 



10. Sandstone 50 



1 1 . Clay shale 100 



12. Coal I 6 



13. Gray, arenaceous clay shale contain- 

 ing some thin sandstone strata which 



are ferruginous in places 500 



14. Coal , 4 



15. Clay shale 250 



16. Coal I 



17. Clay shale 100 



18. Sandstone 25 



19. Clay shale 25 



20. Coal (Grady coal ? } 8 



Total thickness (approximate) .... 1500 



