458 GEOLOGY OF OHIO. 
pends upon the area of land which is above the level of the canal. All 
that part of the county, embracing about nine townships, which lies on 
the east and north-east of the main canal, and west and north-west of 
the Sidney Feeder, is above the highest “level” of the canal—it will 
average about seventy-five feet above the canal. Of course it would be 
possible to gather many times more water from this area than could be 
contained in Loramie Reservoir. While all this area could not be made 
available, yet there must be much of it which could be, were it consid- 
ered a matter of sufficient importance to have it done. Considering, 
then, alone, the great area, both in this county and in the counties above 
this, about the head-waters of the Miami River, there should be no ques- 
tion as to the abundance of the supply of water above the summit-level 
ef the canal to continue it as one of the important avenues of commerce 
of the State. 
THE DRIFT. 
The level of the canal at Sidney is about thirty feet above the 
_rock surface. Add to this distanee the ascertained elevation above 
the canal of any point in the county, and it will give approximately the 
thickness of the Drift or clay, gravel and bowlder deposits. This would 
make the greatest thickness of the Drift on the Towana turnpike one 
hundred and sixty-four feet above bedded rock. Within about two miles 
of Sidney, on the turnpike to St. Mary’s, the elevation measures one 
hundred and twelve feet above the canal at Sidney. Add to this thirty 
feet and we have one hundred and forty-two, which may be very confi- 
dently considered the depth of the Drift at this place. It is true these 
figures may not be the exact measure of the distance from the surface 
down to the solid rock. Other formations which are known to occur 
north of thiscounty, and which overlie the formation which occurs here, - 
may underly the deep drift of the northern part of this county, but this 
is not certainly known to be the case. On the south, at the line between 
this and Miami county, on the Infirmary turnpike, the grade falls forty 
feet below the level of the canal, which is ten feet lower than the top of 
the rock near Sidney. By the course of the river it will be séen that 
there is a dip on the surface of the rock as we go southward. The canal 
rises one hundred and fifty-two feet from Tippecanoe (below Lock 39) to 
the feeder at Sidney. While accurate measurements were not taken of 
the difference in elevation of the top of the Clinton stone in the neigh- 
borhood of Tippecanoe, and the surface of the canal, yet some measure- 
ments which I recorded make the distance about sixty feet. Taking this 
from one hundred and fifty-two makes this formation about ninety-two 
feet at Tippecanoe below the level of the Sidney Feeder; whereas the 
top of the Clinton, where this formation is last seen above Bogg’s mill- 
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