G. F. Wright—Glaciated Area of Ohio. 45 
from the north. It is not unusual to find, many feet below the 
surface, granite from Canada, Corniferous limestone, and frag- 
ments of sandstone, all striated, and intimately mixed together 
in the paste formed by the grinding up of the Erie shales. 
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18x11x8 feet out of ground. Another, near Lancaster, in 
Fairfield county, is 18X12x6 feet out of ground. Granite 
Upon the southern side of the boundary line which we have 
indicated, the whole face of the country immediately changes 
its aspect; till suddenly ceases to occur; no scratched stones 
are to be found; granite bowlders and other transported rocks 
disappear, except in the valleys of the streams. Over the 
whole of this unglaciated area the streams flow in narrow chan- 
nels cut through the horizontal strata of the coal measures and 
of the Waverley sandstone to a depth of from three hundred to 
five hundred feet, and are everywhere lined by terraces of 
