120 Cincinnati Society of Natural History 



the dam recently erected a number of miles below Cincinnati. The 

 overlying strata correspond to the upper part of the Point Pleas- 

 ant beds, beneath the Fulton layer, as exposed at West Covington. 

 Eridorthis occurs at a similar horizon also on the Ohio side of 

 the river, along the lower part of Nine-mile creek. 



About three miles southeast of Point Pleasant, on the Ken- 

 tucky side of the river, at the quarry east of Ivor, there is a gran- 

 ular limestone layer several feet thick, the top of which is 73 feet 

 above the railroad. It is overlaid by several feet of clay shale, 

 and then by a considerable thickness of fossiliferous, interbedded 

 thin limestone and shale. In the upper part of this granular lime- 

 stone I once found a specimen of Eridorthis. At the track level, 

 in the same quarry, a specimen of Orthorhynchula was collected. 

 Fifty feet below track level, Dalmanella hasslcri and Callopora 

 mulfitabulata are common at the river landing. 



In the creek bed of Carnestown, a short distance east of Ivor, 

 the top of this Callopora inultitahulata horizon contains a Praso- 

 pora resembling P. siinuJatrix, specimens resembling Prasopora 

 falesi, Eridotrypa inutabilis, Eridotrypa trciitonensis, Plectanibon- 

 itcs cf. curdsz'illensis, Dalmanella hasslcri, Platystrophia colbiensis, 

 Strophomcna vicina, and Zygospira recnvvirostra. Judging from 

 the sections in Central Kentucky, this fauna belongs directly below 

 the horizon of the Brannon, the most characteristic member of 

 the Flanagan. No equivalent to the Brannon bed is found at 

 Carnestown. A rounded specimen of Prasopora siiindatrix was 

 found by Dr. R. S. Bassler, imbedded like a pebble in the base of 

 the overlying Bigby. The Orthorhynclnda horizon, at the railroad 

 level, is regarded as approximately contemporaneous with the Mil- 

 lersburg division of the Cynthiana. The Eridorthis horizon is 

 correlated with the Rogers Gap beds. The Fulton layer belongs 

 considerably higher, as indicated by the exposures at Brent. 



E. Cynthiana. 



The term Cynthiana formation was introduced to include all 

 strata between the top of the Lexington, as here defined, and the 

 base of the Eden formation ; in other words, between the top of the 



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