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 bounded 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 1s a 
geological section showing the position of the sandstones, as found in the 
Narrows on the Ohio River, in this township: 
Kt. In. 
El eaviye Sand roCcketwesceeese RENEE LUE, JMR, Ueda Gaara MARE leh aes eeemhe OMmO) 
Deity Blue, Slaalesiys wevetis dea e he ae ee NEUES UL EAT alls ARE ee crac lata 8) © 
3. Heavy sandrock, extensively quarried for grindstones .................- 25 0 
AUN SAIGY SHALES wa cas ss aie deca tlateeltmeren alata culo aaa cnc ciciU eile apse eave Ata 20 0 
Oibleaviysandrock ay quarnlead hin placeSmraanessdssceo seca seeneeiee aston aia 36 0 
Gamshalevsomew hat Merrucimouspecenedcmesstacclanectaensnecbacssntkectscealecti tect 4 0 
1 UO COMTETO DSOD SCAT wos ceeclcectenees Meee re ea cie ec Senlae taeecoe eee cacecee tae onetee 6 
Sapnbire=clayvandishale ssi. secstconseecsnsestissee sec teicctacse tales seneyeoeiteusectsae testes 4 0 
oF 0 
Entervalitoy OO) RVers: eee nO aR G RSA Hea RRL ea ae se 492 
(See Map XI., No. 19.) | 
