664 GEOLOGY OF OHIO. 



Lebanon division of the Cincinnati series underlie the western half of 

 Greene county. This area comprises the more eroded portions of the 

 county, as has been already stated, and, lying at a low level, is so heavily 

 covered with the deposits of the modified Drift that the rocks are, for the 

 most part, concealed. There are, however, numerous exposures of the 

 series, especially in Spring Valley and Sugar Creek townships, in which 

 all of its characteristics, both as to order of stratification and fossil con- 

 tents, can be seen and studied to excellent advantage. One hundred 

 feet are shown in the valley of Bear Branch, a small tributary of the 

 Little Miami, which enters the valley opposite Claysville. There is no 

 point in the State where finer specimens of some of the common fossils 

 of the formation have been found than here. Among them may be 

 named Ambonychia radiata, Orthis sinuata, Leptaena sericea, Rhynclwnella 

 capax, Isotelus megistos. Representatives of at least thirty species of fos- 

 sils can be obtained from the section here shown. 



The line^jf junction' between the Lower and Upper Silurian forma- 

 tions is shown as distinctly in Greene county as in any section of the 

 State. One of the favorable points for studying it has already been 

 named, but others almost equally satisfactory are furnished in the neigh- 

 borhoods of Franklin Berryhill and Thomas J. Brown, of Spring Valley 

 township, on Caesar's Creek where it is crossed by the Wilmington and 

 Xenia Turnpike, and in the vicinity of Reed's Hill, in Bath township. 



As elsewhere in south-western Ohio, this horizon is niaiktd by copious 

 springs, to which attention will be more particularly called in the sub- 

 sequent pages of this report. 



The same general order of facts described as occurring in the section 

 at Goe's Station will be found at each of the localities here named. 



The Cincinnati series in Greene county furnishes a small amount of 

 building stone of fair quality, and this is, at present, its only economical 

 application. , 



2. The Clinton limestone comes next in order, and its exposures in 

 Greene county leave nothing to be desired. The fine displays of it along 

 the Little Miami valley, from Goe's Station to Yellow Springs, have 

 already been noted. In addition to the section near Mr. Goe's residence, 

 the stratum can be seen to excellent advantage on the farms of Mrs. Bell, 

 Messrs. J. H. Little, F. Grinnell, A. V. Sizer, and Wm. C. Neff, and in the 

 cuttings for the Grinnell pike at the Little Miami bridge, and near the 

 house of Dunmore McGwin. In Xenia township it is well shown in the 

 banks of Oldtown Run and Massie's Creek, and also near the head springs 

 of Ludlow Creek, on the farms of James Collins and others. In Bath 

 township, however, there are miles of outcrops in which the whole forma- 



