110 Cincinnati Society of Natural History 



in which Hehertella frankfortensis, Rhynchotrema hicrebescens, 

 and other fossils found also at lower horizons continue to occur. 

 A variety of Columnaria aheolata is common at some horizons, 

 especially toward the top. These coarse-grained limestones are 

 regarded by Dr. E. O. Ulrich, in the section southwest of Frank- 

 fort, as forming the basal part of the Catheys, notwithstanding 

 their lithological and faunal resemblance to the underlying Bigby 

 strata, emphasis being placed upon the introduction of new fossil 

 forms, rather than upon the retention of those already familiar 

 at lower horizons. With this interpretation of the section, how- 

 ever, the term Cynthiana can not be synonymous with Catheys, 

 since the base of the Cynthiana rests on the Cornishville 

 bed, occurring much higher in the section than the top of the 

 Brannon member. For the coarse-grained limestone overlying 

 the Brannon member I proposed the name Benson limestone, in 

 a report on the rock phosphates of central Kentucky, still unpub- 

 lished. The Bigby, Brannon, and Benson limestones were included 

 by Prof. Arthur M. Miller under his term Paris. 



Overlying the Benson member, in the southern part of the area 

 of outcrop of the Lexington limestone, is a coarse-grained lime- 

 stone, characterized by the presence of large specimens of Cyrto- 

 donta grandis. This is overlaid by finer grained limestone con- 

 taining the numerous species of gasteropoda and pelecypoda, de- 

 scribed by Ulrich as coming from the upper part of the Trenton 

 in the vicinity of Danville and Burgin, and elsewhere in Boyle and 

 Mercer counties. These horizons form the Fanlconer limestone. 

 The overlying limestone is very fine grained and hard, and of a 

 whitish or light dove color. It is characterized by the presence 

 of various ostracoda, among these, Leperditia linneyi. Lithologic- 

 ally the rock resembles the Tyrone, a formation equivalent to the 

 Black river, and immediately underlying the Lexington limestone 

 in central Kentucky. It has been named the Sak'isa limestone by 

 Prof. Arthur M. Miller. Overlying the fine-grained, dove-colored 

 member of the Lexington limestone is its uppermost member, the 

 Cornishville limestone, about five feet thick, coarse grained, and 

 characterized by the reappearance of Dinorthis nlrichi, Strophom- 



