198 



Cincinnati Society of Natural History. 



correct correlation, the Clinton seems at this place to be entirely 

 absent. Immediately over this rock occurs the yellow more magnesian 

 rock often seen at the base of the Laurel bed, but seen also above the 

 level of the crinoidal rock north of the Rofing and Wagner quarry. 

 It will be remembered that at the latter locality the Clinton actually 

 occured some distance below the crinoidal rock. Possibly at the 

 David Eaton locality the Clinton may be found farther down the 

 creek, though my recollection is that blue clayey shales indicate the 

 presence of the Lower Silurian just below, and suggest the consequent 

 absence of the Clinton. This locality should be more carefully 

 studied. 



42. Osgood. — Following the railroad north east, to the border of 

 the town, exposures of the Clinton are found along the hillside lining 

 the southern side of a country road. The Clinton here is 28 inches 

 thick. It has the same brown color shown by the Clinton at Hanover, 

 Indiana. Some distance farther east the Clinton shows near the base 

 inclusions of brecciated and scarcely rounded fragments of a blue 

 clayey stone of the Cincinnati type. I was hardly able in the short 

 time at my command to decide whether these inclusions were to be 

 considered as pebbles. Immediately beneath the Clinton was the 

 Cincinnati formation with Tetradium and Strophomena alternata var. 

 fracta. Above the Clinton was a soft brownish rock; 76 inches above 

 the Clinton occurred a layer of a whitish crinoidal rock, a few inches 

 thick, containing Atrypa reticularis. This was undoubtedly the rock 

 corresponding to the crinoidal bed north of Rofing and Wagner's 

 school. 



In the Clinton were found Ilkenus daytonensis , pygidium, IUcenus 

 ambigims, pygidium, Plectambonitcs transversalis var. eleganttila, Orthis 

 calligrammay Hanover type, Rhinopora verrucosa, epithecal layer ex- 

 posed, and Heliolites subtubulatus. 



Going to the northern end of the town, a quarry is found on the 

 east side of the road. Here is found a crinoidal whitish rock, strati- 

 graphically the lower part of the Laurel formation (Dayton stone) but 

 differing from usual exposures of this formation in the large nmmber 

 of fossil remains it contains in certain layers. Altogether about 30 

 inches of this rock are exposed. The Clinton is found in the bed of 

 a small stream a short distance eastward, in the fields Between the 

 solid white crinoidal rock in the quarry and the Clinton there is room 



