28 Cincinnati Society of Natural History. 



than it does the Fairview or McMillan, for it is in general 

 a shale formation. In one division, the Liberty, the lime- 

 stone is however more massive and more evenly bedded than 

 the limestone of the Fairview and McMillan formations at 

 Cincinnati. Faunally the Richmond is more closely related 

 to the Eden, representing a return to conditions existing 

 during the Eden stage. The presence of corals in this 

 formation is a distinctive feature. Columnaria, Tetradium, 

 Streptelasma and Protarea, are common. The Richmond 

 formation is divided into six members. 



Arnheim. — The Arnheim is 80 feet thick and has been 

 divided by Foerste into a lower unfossiliferous division, the 

 Sunset, and an upper richly fossiliferous division, the 

 Oregonia. The basal part is exposed in a cut on the 

 C. & 0. Ry. about one mile south-west of Cheviot. This is 

 the nearest exposure to Cincinnati. Homotrypa hassleri is 

 given by Nickles, (loc. cit.) as the type fossil of the division. 



Dinorthis retrorsa, which has a very restricted vertical 

 range occurs 35 feet below the top. Leptaena rhomboidalis, 

 (Richmond form), Rhynchotrema dentata, Streptelasma, and 

 Columnaria, indicate the advent of a Richmond fauna, and 

 unite this division more closely with the overlying than 

 with the underlying strata. 



Waynesville. — Lithologically the Waynesville, (the lower 

 Richmond of Nickles), is largely clay or clay shale of an 

 intense blue color, with a few thin limestone layers, 2 to 5 

 inches thick. It is characterized by the presence of Dal- 

 manella nieeki in great abundance throughout the zone. 

 Calymene callicepkala is abundant, and Leptaena rhom- 

 boidalis, which is present near the top of the division, ex- 

 tends upward into the Liberty. 



Liberty. — The Liberty is composed largely of limestone 

 beds, which sometimes reach a thickness of 8 to 12 inches 

 but average about three inches. The limestone, although 



*Foerste: Ohio Naturalist, vol. 12, No. 1, Jan. 1912, 



