114 Cincinnati Society of Natural History 



also at the base of the cut 59.1 miles south of Ludlow, or one mile 

 north of Rogers Gap. This coarse-grained limestone may corre- 

 spond to the coarse-grained rock containing Clitambonites in the 

 vicinity of Carlisle. 



At the railroad cut 59.1, one mile north of Rogers Gap, the 

 coarse-grained limestone is immediately overlaid by argillaceous 

 strata in which Eridorthis rogersensis and Eridorthis nicklesi are 

 fairly common ; this is the horizon also for Clitambonites rogers- 

 ensis, but the latter is far less common. Hebertella latasulcata is 

 rare. A poorly outlined specimen, which occurred at the same 

 level, may have been an Orthorhynchula. 



Eight feet above the coarse-grained basal layer, Strophomena 

 higginsportensis was found. At about this same horizon Platystro- 

 phia colbiensis and the Rogers Gap form of Dalmanella occur. 

 The immediately overlying strata contain Perenopora vera, Hetero- 

 trypa foerstei, Cyclonema varicosum-cincinnatiense, and Ortho- 

 ceras rogersensis. At a still higher horizon, in the upper part of 

 this railroad cut 59.1, Bellerophon rogersensis, Tetranota obsoleta, 

 Liospira vitruvia, and a small unknown Lophospira, described on 

 the later pages of this paper, are common. This gasteropoda 

 horizon is quite constant in the area between Rogers Gap and 

 Sadieville, and is useful in correlating the different sections. At 

 about the same elevation, or immediately above, the following 

 species occur : Ectenocrinus grandis, Constellaria euiaciata, 

 Lingula cf. cincinnatiensis, Hormotoma terebriformis, Hormo- 

 toma gracilis-sublaxa, Holopea incerta, Byssonychia vera, Modi- 

 olopsis rogersensis, a species of Orthodesma belonging to the 

 subnasutum group, and another belonging to the nasntitm group, 

 Lyrodesma subplanum, Orthoeeras rogersensis, Isotelus benjamini, 

 and a species of Calymene. Near the top of the railroad cut Con- 

 ularia trentonensis-rogersensis and Eridorthis rogersensis were 

 collected. Farther south the following species were collected at 

 about the same horizons as those exposed at the railroad cut 59.1, 

 one mile north of Rogers Gap : Crepipora venusta, Lichenocrinus 

 subaequalis, Strophomena hallie, Byssonychia byrnesi, and Fiisi- 

 spira sulcata. Strophomena hallie is very rare at these lower hori- 



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