6 Ciiicinnati Society of Natitral History. 



in east-central Kentucky. The Calyinene clintoni and Bey- 

 richia lata fauna is confined practically to Lewis county, in 

 Kentucky. The great numbers of Dalmanites liinulurus and 

 Hoinolanotus dclphinoccpJialus appear restricted to a single 

 locality in Lewis County : that exposed by the bluff northwest 

 of Martins. Moreover, the barrier does not appear to have 

 remained down long enough to permit any considerable part 

 of the eastern faunas to enter Kentucky and Ohio during any 

 one of the periods of deposition here mentioned. In each case 

 only a small number of species is distinctly eastern, and the 

 great majority remain western. 



The Cedarville limestone of Ohio contains a distinctive 

 Guelph element, and its Guelph affinities were recognized by 

 Professor Orton. The fauna of the Springfield limestone is 

 practically unknown. 



Overlying the Hillsboro sandstone, in southern Ohio, is 

 the Greenfield limestone, apparently the lowest member of 

 the Monroe formation of Michigan and Northern Ohio. 



At Kokomo, in north-central Indiana, at least forty feet of 

 limestone are extensively quarried which are characterized by 

 the evidence of very thin lamination of their bedding planes, 

 often beautifully shown on weathered surfaces, and also by 

 the presence of various eurypterids, or merostomata. This 

 eurypterid horizon is overlaid by a series of limestones of more 

 normal type, not thinly laminated, in which a rather rich 

 brachiopod fauna is present. This brachiopod horizon should 

 probably be distinguished from the eurypterid horizon by a 

 distinct name, and the designation, Kokomo limestone, should 

 be restricted to the eurypterid beds, but at present no suitable 

 name is at hand. The eurypterid horizon, and probably also 

 the overlying brachiopod horizon, are regarded as of Salina 

 age. In New York, the Salina forms the lower division of 

 the Cuyahogan. 



It is impossible, at present, to determine what are the rela- 

 tions between the Greenfield limestone of Ohio and the Salina 

 horizons at Kokomo. Both areas undoubtedly were connected 



6 



