THE 
AMERICAN NATURALIST. 
Vor. xvit.—fUweE, 1884.—No. 6. 
THE THEORY OF A GLACIAL DAM AT CINCINNATI 
AND ITS VERIFICATION. 
BY PROFESSOR G. FREDERICK WRIGHT. 
: E Prosecuting investigations upon the boundary of the gla- 
ciated area in the Ohio valley, one of the most interesting facts 
brought to light is, that the true glacial drift is found on the 
; ky hills a few miles south of the Ohio, opposite Cincin- 
| Mt. Granitic boulders, striated pebbles, and till are found all 
ver Brown and Clermont counties, in Ohio, down to the margin 
| of the Ohio river, where they cease. Nothing of the sort is 
l found on the hills in Bracken county, Ky. But on crossing the 
4 on New Richmond in Clermont county, Ohio, to a point 
ore tucky near the boundary of Kenton and Campbell counties, 
Blacial drift at once reappears upon the south side of the river at 
i an elevation of three hundred or four hundred feet, cover- 
me hills for two or three miles back from the river. Till sev- 
P here occurs, containing numerous granitic pebbles 
; an — boulders and excellent specimens of striated stones, 
1 native place is not far north in Ohio. 
a tea Personally go over the hills in the northern part of 
l : l county, but did explore Northern Kenton and Boone 
: Swith considerable minuteness, and found glacial deposits 
kamer the northern part of Boone county as far south as 
| About three miles east of Burlington, on the road 
ofa ace, there is, for instance, a notable collection of boulders, 
~~ I counted fifteen or twenty in the space of a few yards. 
“rad n a shallow valley of Gunpowder creek, a small stream 
; ‘the Ohio near the southern part of the county. This clus- 
3 ie: yi, 
