The Cincinnalian Series and its Brachiot)ods. 



21 



proportions vary in different formations, but the general 

 litholqgical characters are quite uniform throughout the 

 series. The shales arc blue and calcareous, thin-bedded, 

 and poorly consolidated. In place, they are firm and com- 

 pact, but soon crumble on exposure to weathering. Al- 

 though in general, the shale contains a rather poor fauna, 

 specimens of some of our rarer fossils which are seldom 

 found in limestone strata, have been found beautifully pre- 

 served in the shale. 



The Cincinnatian series is divided on lithological and 

 faunal grounds into five formations, each of which is again 

 subdivided, as shown in the following table. The classifica- 

 tion used here follows Bassler for the Eden, Fairview, and 

 McMillan formations, and Cumings for the Richmond. 



Elkhorn 

 Whitewater 

 Saluda 

 Richmond'' . . . . i Liberty 



Waynesville 

 Arnheim J O^egonia 



Cincinnatian. . . 



vSunset 



I Mt. Auburn 



McMillan^ . . . A Corryville 



I Bellevue 



„ . . + f Fairmount 



rairview' \ ^^ ^^ 



\ Mt. Hope 



f McMicken 



Eden^ \ Southgate 



[ Economy 



Utica Fulton^ 



*Cumings: Ind. Dept. Geol. Nat. Res., 32nd Ann. Rep., 1907, p. 621. 



tBassler: U. S. Nat. Mus., Bull. 92, 1915, vol. 2, pi. 2. 



JFor the use of this term see Bassler: Proc. U. S. Nat. Mus. xxx. No. 1442, 1906, pp. 8, 9; 



Foerste: Science, N. S., vol. 22, 1905. pp. 150, 151; Ulrich: Bull. G. S. A., vol. 22. 



1911. pp.296, 297. 



