552 



APPENDIX. 



Section in Central Tennessee. 1 



Names of Formations. 



Summit removed by 

 erosion. 

 I St. Louis limestone. 

 I -^^-Unconformity -^ 

 Tullahoma forma-l 



tion. 

 Unconformity 



Thickness 

 in Feet. 



n 



H 



Chattanooga shale. 

 Unconformity -^— 



Unconformity — ^ 

 Fern vale formation. 

 -~— ■ Unconformity-^ 



Leipers formation. 



-~-~- Unconformity^- 



Catheys formation. 



250 



0-250 



0-10 



0-60 



0-40 



0-100 



0-100 



Characteristics. 



Gray and blue, thick-bedded, f ossiferous; 

 generally very cherty; basal part porous. 



Greenish elay shale at bottom, cherty shale 

 and limestone above. 



Black and carbonaceous, generally with phos- 

 phatic band at base, and glauconitic green 

 shale, with phosphatic nodules at the top. 



Even-bedded, dense, light-gray or bluish; oc- 

 casionally shaly below. 



Soft green- and chocolate-colored shales, and 

 red, ferruginous, crystalline limestone; occa- 

 sionally conglomeratic and phosphatic. 



In eastern part of quadrangle, knotty, earthy 

 limestone at top, with shaly and highly fos- 

 siliferous beds below; in western part, granu- 

 lar, crystalline limestone, the more granular 

 portions highly phosphatic. 



Shales and knotty limestones, usually under- 

 lain by heavy-bedded subcrystalline lime- 

 stone, and overlain by fine-grained blue or 

 earthy limestones separated by thin seams of 

 shale. Basal part includes some granular 

 phosphatic layers. 



Bigby limestone. 



30-100 



Hermitage formation. 



— — Unconformity- 

 Carters limestone. 



40-70 



40-60 



Granular, crystalline, laminated, phosphatic 

 limestones; upper part often shaly or arena- 

 ceous, lower part has some shale but is never 

 sandy. 



Even-bedded, alternating, thin layers of argil- 

 laceous or siliceous limestone and shale in 

 lower third, and siliceous subgranular lime- 

 stone, more or less phosphatic, in middle 

 and upper parts. 



Heavy-bedded, fine-grained, white or light- 

 blue; often contains chert and silicified 

 fossils. 



! Lebanon limestone. 

 [ Base not exposed. 



70-100 



Thin-bedded, 

 colored. 



often shaly, bluish or do^ 



Strata somewhat warped but nearly horizontal. 



1 Hayes and Ulrich. Columbia (Tenn.) folio, U. S.'Geol. Surv. 



