384 GEOLOGY OF OHIO. 



crinus 0. Nealli, Hall, and Poteriocrinus caducius, Hall, both of which, as 

 well as the form named above, were discovered J. Kelly O'Neall, Esq., of 

 Lebanon. • 



The most valuable single section, however, remains to be named in a 

 b ranch that comes directly down from Morris's Hill, and which enters 

 he Little Miami opposite the mouth of Caesar's Creek. Its value lies in 

 he fact, that, star't.ing at the river from the summit of the Cincinnati 

 section, it completes the series to the Clinton Limestone (Upper Silurian) 

 in a short course, almost every foot of which is laid open for examina- 

 tion. Attention has been already called to this section in the general 

 discussion of the Cincinnati Group, and use has been made of it in de- 

 termining the thickness of the Blue Limestone series. 



The vicinity of Waynesville, though giving a less extended section, 

 has been found wonderfully prolific in fossils. The smaller trilobite, 

 especially, Calymene senaria, has been found here in greater numbers 

 than anywhere else. The collection of Israel Harris, Esq., of Waynes- 

 ville, is, doubtless, the finest ever made in this country in this particular 

 fossil. It includes not less than one thousand specimens. In this neigh- 

 borhood, also, the rare fossil Trochoceras? Baeri, Meek, has been found. A 

 single specimen was obtained from a piece of flagging that had long been 

 laid in one of the sidewalks of the main street of the village. The only 

 other points in the State where it is now known to occur are Camden, 

 Preble county, and Clarksville, Clinton county. The specimen upon 

 which the species was established came from Eichmond, Ind. 



On the western side of the county some of the tributaries of Clear 

 Creek furnish fine ground for gathering fossils, exposing the same por- 

 tion of the series already referred to. 



Morris's Hill, already named as the highest elevation measured within 

 the county limits, contains a finer show of two corals that mark the junc- 

 tion of the Lower and Upper Silurian than is elsewhere found. These 

 corals are a species of Tetradium {T. Jibratum ? Saflford) and a Stromatopora. 

 Both occur in massive forms and in great abundance. 



CLINTON LIMESTONE. 



The Clinton Limestone, the next formation in ascending order, occurs 

 in all of the outliers of the Cliff Limestone that are found in the county, 

 and to which attention has already been called. All of the characteris- 

 tic peculiarities of this formation are here shown with great distinctness. 

 Its lower beds are of a sandy texture, and give to it the local name of 

 sandstone. It will, however, be borne in mind that no silica, or, at least, 

 no notable portion of silica, enters into its composition. It is a lime 



