702 A. F. FOERSTE 



division of the Cayugan of New York. Very little is known of 

 the Cayugan in Ohio or Indiana beyond the fact that it is much 

 thicker in the northern parts of these states and thins out south- 

 wards. It has not been detected south of the central part of 

 Indiana, but in Ohio it it has been followed beyond Greenfield 

 to the southern boundary of the state. It appears to cross the 

 Ohio River into the northern part of the state of Kentucky. 

 Recent observations suggest that the Cayugan (Greenfield or 

 possibly Monroe) limestone of southern Ohio and northern Ken- 

 tucky is unconformable to the Niagaran. 



The Paleodevonic has not been recognized in Ohio, Indiana, 

 or Kentucky. Various sandy beds have at different times been 

 referred to the Oriskany, upon lithological rather than upon 

 paleontological data. 



The base of Mesodevonic is represented in central Indiana by 

 the Pendleton sandstone, referred by Hall to the Schoharie Grit. 

 The Coriiiferous or Onondaga li?nestone extends to the central 

 part of the state of Kentucky, on both sides of the Cincinnati 

 geanticline.^ Indeed, in central Kentucky, the Corniferous is 

 exposed at various points along the crest of the geanticline. 

 East of the geanticline it extends as far south as the lower parts 

 of Fishing Creek, west of Somerset. In Indiana and western 

 Kentucky, the Hamilton, represented by the Sellersburg bed, is 

 not known south of Louisville. In Ohio, on the eastern side of 

 the geanticline, the Sandusky or Delaware limestone has been 

 identified as the lower part of the Erian, and the Olentangy 

 shales as the upper or Hamilton part. Neither of these beds 

 has been identified south of the central part of the state. It 

 does not reach the Ohio River, and certainly has not been seen 

 in Kentucky. 



There is no doubt about the presence of the Cincinnati 

 geanticline in central Kentucky and in the neighboring parts of 

 Indiana and Ohio, in times preceding the deposition of the 

 Corniferous. The unconformity between the Corniferous and the 

 various Niagaran and Ordovician strata is often very striking, con- 



' Charles Schuchert, "On the Faunal Provinces of the Middle Devonic of 

 America." Am. GeoL, Vol. 32 (1903), No. 3. 



