114 



Carl O. Dunbar, 



Generalized Devonian Section of Western Tennessee 



SERIES 



GROUP 



Pk 



Chautau- 

 quan 



Senecan 

 Erian 



Ulsterian 



Oriskanian 



Helder- 

 bergian 



or 

 Linden 



formation 



THICK- 

 NESS 



character 



Chattanooga shale 

 Hardin sandstone 

 member 



Break 



Pegram limestone 

 Break 



Camden chert 

 Break — 



Harriman chert 

 Break 



Quail limestone 

 Break 



Decaturville chert 

 Break 



Birdsong shale 

 Break 



g Flat Gap 



>-< 

 o 



rS Bear Branch — 

 K j Pyburn 



> 

 O Ross 



— Break - 



Rockhouse shale 



2o'± Black fissile carbona- 

 j ceous shale 

 Thin basal sandstone 



Heavy-bedded white 

 limestone 



Thin-bedded buff col- 

 ored novaculite 



30 — 55' Heavier bedded white 

 , and buff novaculite 



io'± Heavy-bedded cherty 

 gray limestone 



6'± Porous grav chert 



35-65' 



Bluish shaly limestone 

 and shale 



o — 53' iMassive pure lime- 

 stone 

 Massive limestone and 



— 45' oolitic hematite in 



north — impure 

 cherty limestone in 

 south 



— 6o'± Impure thin-bedded 

 cherty limestone 



0—26' 



Bluish green calcare- 

 I ous shale 



