8 Bulletin of Laboratories of Denison University [Voi. xi. 
near Evansville, that a pre-glacial stream of any importance is 
to be found in the bed of the Ohio. 
THE PROBABLE SOUTHERN LIMIT OF THE ICE-SHEET. 
Charts of the terminal moraine represent it as crossing the 
Ohio River at four different points. 
It is doubtful whether the glacier ever reached the left 
bank of that stream except as a spur from the mouth of the 
Great Miami. 
If this opinion were made in the form of a definite asser- 
tion, it would need to be supported by a very distinct record of 
accurate observations ; and these I have been unable to make. 
It is permissible for me, however, to present the reasons for 
my belief, leaving them to be confirmed or refuted, as they 
may deserve, by those who will have an opportunity for mak- 
ing a thorough investigation of the region. 
Glacial drift has been found in quantity on the hills about 
Cincinnati; at “Split Rock;” and about the mouth of Ken- 
tucky river. These points have been connected, on some 
charts, by a line approximately straight ; and this line is called 
the terminal moraine. It may be; I do not wish, at present, to 
say that it is not. But on such limited portion of the ground 
as I have had a chance to examine, I can find no evidence that 
it is a fact. There is no drift in Hogan’s creek, at Aurora, at 
a greater height than it is to be found in the opposite Kentucky 
bottoms. There is none on the hills just south of that town. 
There is none in the valley of Laughery creek below the town 
of Hartford, eight miles from its mouth, except one small mass 
which is plainly a water deposit. There is none in the ravines 
or along the hill-sides on the road from Hartford to Rising Sun. 
Yet the maps show that all this area, except in the vicinity of 
Rising Sun, was under the ice-sheet. The heavy deposit about 
the mouth of Woolper’s creek, known as “ Split Rock ” and 
“Kirby’s Rock,” (I), which is called the moraine, is not a 
moraine and has no resemblance to a moraine except at the 
western face — which part is plainly visible from the river. 
Fifty feet back from this face, along the south side of Wool- 
