46 G. F. Wright—Glaciated Area of Ohio. 
ravel which are far above the present high-water mark. The 
hio River, from far below Cincinnati to the head waters of 
the Alleghany and Monongahela Rivers, a distance of more 
than fifteen hundred miles, occupies a narrow pre-glacial val- 
ley, and was the great distributer of the drift brought into it 
by the streams from the north which all along emerged during 
the Glacial period from the ice-front, and which in some places 
approached to within a few miles of the river. Upon the high- 
lands in this unglaciated region the soil is shallow, and consists _ 
of the remnants of the rocks in place which have been disinte- 
grated by sub-aerial agencies. The contrast between the gla- 
ciated and the unglaciated areas of Ohio appears upon the 
aed of the Annual Crop Report. According to the Report 
or September, 1882, the average production of wheat per acre 
in the glaciated area, reckoned by counties, is in many cases 
twice as great asin the unglaciated. The average production 
per acre in the whole glaciated area is about fourteen bushels, 
and in the unglaciated, nine bushels. 
e southern margin of the glaciated area of Ohio is not 
everywhere marked by such a relative excess of accumulation 
of glaciated material as is found through Cape Cod, on the 
county, twelve miles north of the Ohio River, and continues 
nearly west to the middle of Stark county where it turns more 
to the south, crossing the northern part of Holmes county, to 
the northeast corner of Knox, where it turns at right angles to 
the south, running through the eastern part of Knox and Lick- 
ing counties, the western part of Perry, turning here so as to 
pass through Lancaster in Fairfield county; touching the 
western edge of Hocking and entering Ross at Adelphi, in the 
northeast corner. Here it turns to the west, crossing the Scioto 
Valley a few miles north of Chillicothe, and emerging from the 
county at its southwest corner, proceeding thence through the 
southeastern corner of Highland, the northwestern of Adams, 
reaching the Ohio River in the southern part of Brown county, 
near Higginsport. Cincinnati was completely enveloped by 
ice during the Glacial period, and extensive glacial deposits 
exist in the northern part of Campbell and Boone counties, 
Ky., and near Aurora, in Dearborn county, Ind. 
