Cincinnation and Lexington Fossils 19 



been chosen for the lower Arnheim. It is suspected that this lower 

 part has closer affinities with the Mount Auburn fauna than with 

 the upper Arnheim. 



The Saltillo limestone, characteristically exposed along the 

 Tennessee river in Western Tennessee, was described in the Janu- 

 ary-February number of the Journal of Geology in 1903. It con- 

 tains the following fauna : 



Tremofis punctostriata, Hall; Schizocrania rudis, Hall; Lep- 

 taena tenuistriata, Sowerby, var; Leptohohis lepis-cliftonensis; 

 Lingiila wayneshoroensis ; Dalmanella; Zygospira recurvirostra, 

 Hall; Clidophoriis sp., near neglectus, Hall; Whitcavesia cincin- 

 natiensis, Hall and Whitfield ; Calymene platycephala. 



The Hermitage limestone, typically exposed in Davidson 

 county, Tennessee, and thence southwestward, through William- 

 son and Maury counties, was accurately described by Hayes and 

 Ulrich in their Columbia Folio, published in the fall of 1903. It 

 appears to be the stratigraphical equivalent of the Saltillo limestone, 

 and contains the following species, according to Ulrich : 



Prasopora patera; Prasopora simnlatrix; LeptoboJus lepis; 

 Dalmanella fertilis; Zygospira recurvirostra; Ctenodonta, small 

 circular species : JVhiteavesia cincinnaticnsis ; Lophospira ahnormis. 



The Logana limestone, typically exposed in Jessamine. Wood- 

 ford, and h^ranklin counties, Kentucky, was described in the bul- 

 letin on the Lead and Zinc bearing rocks of Central Kentucky, by 

 Prof. Arthur M. Miller, in 1905. It appears to be approximately 

 equivalent to the Hermitage and Saltillo limestones of Tennessee, 

 and contains the following fauna : 



Liiigiila iiiodesta, Ulrich; Lingula covin gtonensis. Hall and 

 Whitfield; Trcniatis punctostriata. Hall; Crvptolitlms tessellatus 

 ( = Trinucleus conccntricus) . 



Of the various species listed from the Saltillo, Hermitage, or 

 Logana limestones, the following occur at Cincinnati, Ohio, in the 

 lower fifty feet of rock there exposed, below the Fulton layer which 

 contains the Triarthrus becki or L^tica fauna : 



Prasopora simnlatrix ; Lingula nwdesta; Lingula covingtonen- 

 sis; Whitcavesia cincinnaticnsis; Lophospira abnonnis; Crxpto- 

 lithus tessellatus; Schisocrania schuchcrti is regarded as closely 

 related to Schizocrania rudis. and Leptobolus lepis evidently is re- 

 lated to the variety found in the Saltillo limestone. 



Owing to the presence of similar or identical species in the 



