374 The Ohio Journal of Science [Vol. XIX, No. 7, 



manites brevigladiolus is most nearly related to Dalmanites 

 platycaiidatus from the Racine of Illinois. Provisionally, the 

 Lilley member is correlated with the Louisville member of 

 Southern Indiana and the adjacent parts of Kentucky. 



An approximate correlation of the Bisher member with 

 Niagaran strata in New York state is made possible by the. 

 fact that the upper part of the Crab Orchard shale, which lies 

 immediately beneath the Bisher member, contains Liocalymene 

 clintoni, Beyrichia lata, and other fossils occurring in the middle 

 part of the typical Clinton section of New York. In the 

 overlying Irondequoit limestone, however, at the top of the 

 Clinton of New York, occur numerous species found also in the 

 Bisher member, including CornuUtes clintoni, Orthis flabellites, 

 Spirifer radiatus, Rhynchotreta americana, Whitfieldella cylin- 

 drica, Anastrophia interplicata, Stephanocrinus gemmijormis, 

 Trimerus delphinocephaliis and Bumastus ioxns. Provisionally, 

 therefore, the Bisher member is correlated with the Irondequoit 

 limestone of New York. 



The coral element in the Lilley fauna suggests correlation 

 of the Lilley member with the western extension of the Lockport 

 dolomite, as it is seen on Manitoulin and Drummond islands, 

 in the northern part of Lake Huron. Such fossils as 

 Cyathophylhim radicnia, Omphyma verrucosa, and Strombodes 

 striatus are characteristic of this western phase of the Lockport. 



If the Bisher fauna be correlated with the Osgood of Indiana 

 and the Irondequoit of New York, and if the Lilley fauna be 

 correlated with the Louisville of Indiana and Kentucky and 

 with the Lockport of southern Ontario, then it is possible that 

 a gap in time exists between the two, although this gap may be 

 filled partially by that part of the fauna of the Bisher member 

 which exists in its upper layers, this fauna not having been 

 sufficiently studied so far to determine the question. 



In Ohio, Strombodes striatus has been found also in the Spring- 

 field limestone, at the base of the excavation for the Lockington 

 dam, four miles north of Piqua, Ohio. 



The relationship of the Lilley fauna appears to be with the 

 overlying Guelph, rather than with the underlying Bisher 

 fauna. 



It is believed that eventually it will be found that the line 

 of separation between the Bisher and Lilley members of the 

 Niagaran must be drawn considerably higher than the line 



