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Cincinnati Society of Natural History. 



character of the Dayton limestone. Beneath this lies the Clinton, 

 having here a thickness of about twelve and a half feet. About the 

 same thickness was measured at Lewisburg. At the top of the 



Clinton, the rounded species, Favosites favosidms l was rather common. 

 Beneath, in bluish, purplish or reddish Clinton, were found: Orthis 

 eleganhtia, Rhinopora verrucosa^ PhyUoporina an^utata, Favosites favosus, 

 and Halysitcs eaten u/atus . About 7 feet below the top of the Clinton 

 occurred about 15 inches of a very white stone, containing fragments 

 of Hemitrypa ulrichi rather abundantly. Pachydictya turgida and 

 Stropkomena patenta also occurred here. The total thickness of the 

 Clinton here is about 13 feet. 



Going down the creek from this point a moderate distance, the 

 Clinton is found to be underlaid by greenish blue shaly courses, of 

 which at least three feet are exposed. A small specimen of Tetradium 

 was found within a foot of the base of the Clinton, thus testifying to 

 the Lower Silurian character of these shales. Lithologically, 

 however, they occupy the place of the shaly courses elsewhere called 

 the Belfast bed in this western region of exposures. Above the shale 

 exposures just mentioned the Clinton forms a steep wall. Huge 

 blocks of Clinton have fallen down at one point, and a coarse wave 

 marking was noticed on the face of one, indicating the presence at this 

 locality of a wave marked layer of not very great distinctness at about 

 the middle of the Clinton. 



33. Enterprise locality. — From Ingomar on the Cincinnati, 

 Jackson and Mackinaw Railroad, south three fourths of a mile to the 

 north end of Enterprise; then one mile west, and one third of a mile 

 south. At this point on the southern slope of the hill, near its top, 

 the road crosses an exposure of Clinton. The part actually in sight 

 comprises only a few inches the lower 10 of which are finer grained, 

 much decayed, and hence brownish. Some of the upper layers were 

 evidently coarsely crinoidal, as far as can be judged by loose boulders. 

 Beneath the Clinton were 12 inches of greenish clay, next, limestone 

 fragments with Otihis biforata, O. oeeideuta/is, and Tetradium. Perhaps 

 40 inches beneath the Clinton, therefore next in order, is found a 

 layer containing very large growths of Tetradium, there being several 

 masses 4 feet in diameter and 15 inches high. On top of these corals, 

 stranded, and imbedded in the mud covering their upper surfaces are 

 a number of specimens of PaLeaster and Agelacrinites, and several 



