472 GEOLOGY OF OHIO. 



bones of the mastodon are found almost exclusively. These animals 

 were contemporaries. Did they have distinct and separate haunts ? 



WARREN TOWNSHIP. 



• 



This township lies east of Barlow and south of Union townships. It 

 is hounded on the south-east by the Ohio River. It is drained by the 

 waters of Wolf Creek on the north and west, by Little Hocking on the 

 south-west, by Indian Creek on the north-east, and by several small 

 streams flowing into the Ohio, of which the principal are Mile Run, 

 Scott's Run, and Bailey's Run. From the high lands on section 16 and 

 vicinity the streams flow in almost every direction. The soil on the 

 Ohio River is most excellent, and that of the valleys of the smaller 

 streams productive. Many of the shales in the hills are rich in small 

 concretions of lime, and when disintegrated form a good soil. It is prob- 

 able that these concretions change in places into thin layers of limestone. 

 No thick seam of coal could be found, but the thin Hobson seam, found 

 in townships to the west, is often met with in its proper geological hori- 

 zon. This seam is exposed in the railroad cut, under the heavy sand- 

 rock, in the Narrows below Harmar. It is here of no economic import- 

 ance. Traces of a higher seam were observed, but the seam must be 

 very thin. 

 • The most valuable feature in the economic geology of this township is 

 the sandstone of very superior quality for grindstones and for build- 

 ing purposes found in heavy ledges along the Ohio River, hills. No 

 towns in the Second District are so rich in grindstone material as War- 

 ren and Dunham. There has been an increasing traffic in grindstones 

 from these townships for the last forty years and more. There is an 

 almost inexhaustible supply of stone admirably adapted to this import- 

 ant manufacture. Almost every variety of texture and grit is to be ob- 

 tained, and the prepared stones are sent all over the country. The busi- 

 ness is capable of almost indefinite development. The following is a 

 geological section showing the position of the sandstones, as found in the 

 Narrows on the Ohio River, in this township : 



Ft. In. 



1. Heavy sandrock 30 



2. Blue shale ' 9 



3. Heavy sandrock, extensively quarried forgrindstones 25 



4. Sandy shale 20 



5. Heavy sandrock, quarried in places 36 



6. Shale, somewhat ferruginous 4 



7. Coal, Hobson seam 1 6 



8. Fire-clay and shale 4 



9. Interval to Ohio River 42 



(See Map XI., No. 19.) 



