48 G. F. Wright—Glaciated Area of Ohio. 
and onward to the south pretty closely approach the boundary 
of the glaciated region. Through the southeastern corner of 
Highland county and the northwesterii of Adams, the terminal 
accumulation is less marked than in Ross county ; still the 
boundary of the glaciated region is easily determined. It ap- 
proaches the river in the vicinity of Ripley and Higginsport in 
Brown county, and crosses it from Clermont county, so as to 
enter Kentucky a half mile north of the line between Camp- 
bell and Pendleton counties. Cincinnati was, as I have said, 
covered with ice during a portion of the Glacial period. . There 
is an undoubted deposit of till, at the railroad station at Wal- 
nut Hills, nearly 400 feet above the river. At North Bend 
the tunnel of the sera ep Cincinnati and LaFayette ~ 
road, leading from the Ohio to the Miami, is tee i an acc 
mulation of till which rises 300 feet above the ri 
But the most interesting fact of all is, that te ice extended 
across the Ohio River into Campbell , Kenton, and Boone coun- 
ties, Ky., leaving granite bowlders and deposits of till upon the 
hilltops more than five hundred feet above the river. The glacial 
boundary first crosses the Ohio River twenty-five miles above 
Cincinnati, entering Kentucky near the southwestern corner of 
Campbell goes nearly opposite Pt. Pleasant, in Clermont 
count ill, containing granite bowlders and scratched 
pebbles, covers the hills in the vicinity of Carthage, Campbell 
county, and continues, to a greater or less extent, south along 
the ridge road as far as Flag’s Spring. Here all signs of glacia- 
tion suddenly disappear. At Flag’s Spring occurs an extensive 
deposit of water-worn pebbles which have been cemented to- 
ee! by lime. The pebbles are themselves mostly of lime. 
he deposit is in a valley tributary to Twelve Mile Creek 
(which runs to the north), and rises from twenty to thirty feet 
above the present valley. It resembles in nearly every respect the 
post-glacial conglomerate known as “Split Rock,” at the mouth 
of Woolper Creek, about twenty-five miles below Cincinnati, 
where the glacial boundary recrosses the Ohio, and enters Indi- 
ana near Aurora. Whether there are granite pebbles in the 
conglomerate at Flag’s Spring I am unable to say, owing to the 
haste with which I was compelled to examine it. at 
Woolper Creek, granitic pebbles in small quantity form a 
constituent element of the conglomerate. One was observed 
which is two feet in diameter. The limestone pebbles in this 
conglomerate are frequently three or four feetin diameter. As 
pointed out forty years ago by Prof. Locke, and noticed later 
by Dr. Sutton, this conglomerate at Woolper Creek is not 
confined to the immediate vicinity of the Ohio; though there 
it rises more than one hundred feet above low water mark. 
The conglomerate is conspicuously developed on the summit of 
