386 GEOLOGY OF OHIO 



ing to the direction shovvn generally by the gKcial strise in this district, 

 the nearest point from which it could have been derived is the high 

 ground between Morris's Hill and Genn Town. 



Spring Hill, or Wilkerson's Hill — the outlier fnarked D on the map — 

 lying upon the eastern line of the county, is worthy of mention as the 

 most southerly of the Clinton limestone outliers in south-western Ohio. 

 It is traversed by the Lebanon and Wilmington road, and may be recom- 

 mended as giving the clearest and most interesting exhibition of the line 

 of junction of Lower and Upper Silurian formations shown in the county, 

 and indeed in this respect it is not surpassed in the State. The Clinton 

 beds here yield in their outcrops very beautiful fossils, especially of the 

 corals that belong to them. 



THE NIAGARA LIMESTONE. 



The main outlier, marked A upon the map, adds to the scale of the 

 county the Niagara formation. This great division, it will be remem- 

 bered, generally begins with beds of shale, but in south-western Ohio a 

 local exception is often marked in the occurrence at this point of a very 

 heavy and even-bfidded limestone, of great value for building stone, 

 known quite extensively as Dayton done. 



This variety of the lower beds of the Niagara occurs in Warren county. 

 It is shown most clearly in its connections on the land of Stephen Bur- 

 nett, three miles north of Waynesville. In a valley near Mr. Burnett's 

 house, the uppermost beds of the Cincinnati group are exposed, and the 

 Clinton limestone overlying them, while in the fields a few rods beyond 

 a valuable ledge of glacial planed Dayton stone is found. It has been 

 quite extensively quarried here. There are several other quarries of the 

 same stone in this outlier, the most valuable of which are located along 

 its southern extension. The heaviest section measured is found on the 

 farm of Dr. William Stokes. The Niagara shales here overlie the Clin- 

 ton limestone, and the higher courses, or the Springfield beds, furnish 

 excellent quarry stone. This section has a thickness of at least fifty feet, 

 a fact which agrees with one already stated, viz., that the highest land of 

 Warren county is to be looked for in this very locality. 



These three formations — the Cincinnati group, the Clinton and Niagara 

 formations — complete the geological scale of the county, so far as its bed- 

 ded rocks are concerned. 



DRIFT. 



The drift beds of the county have no feature to distinguish them in 

 any way from those of the adjacent counties already discribed. The 



