4 BiiUetin of Lahoi^atories of Denison Uiiiversity [Voi. xi. 
It is a noteworthy fact that from Sugar creek to Peters- 
burg almost every creek that comes in on either side, whose 
source is in the hills, flows in a direction opposite to the Ohio 
until it reaches the bottom land, when it turns in a way to con- 
form to the course of the river. It seems odd while going 
down the main stream, to look toward the head of nearly every 
tributary, large or small, whose valley is in the line of vision. 
For eight miles below Aurora the Ohio, flowing on a rocky 
bottom, closely hugs the Indiana side ; from Petersburg to some 
distance below Grant’s Landing the ancient channel is now con- 
cealed by the drift on the Kentucky side. Laughery creek, 
after receiving the Sugar creek tributary two miles below 
Aurora, and Hogan’s creek at that town, flowed north into the 
broad valley now held by the Great Miami ; but instead of fol- 
lowing the present bed of that stream (with a reversed current, 
of course), it held the same general direction with which it en- 
tered the valley, until on reaching the point (L) it swerved east- 
ward, reaching the Great Miami valley again near the north line 
of Hamilton county at (E), and followed that valley to the city 
of Hamilton where it united with the Licking. 
Beyond this place no 'examination has been made ; but 
some ancient channels marked out in the reports of the Ohio 
Geological Survey indicate that the Licking received another 
tributary in this vicinity, made a detour to the east of Dayton, 
then bore northwest, past Troy. Prof. Tight has shown that 
Kanawha flowed north through the Scioto valley, and turned 
toward the northwest near Circleville; so Licking must have dis- 
charged into it in the neighborhood of Piqua. 
THE FORMATION OF THE OHIO RIVER. 
It will 'simplify an explanation to retain for the ancient 
drainage lines the names of the present streams, using them as 
they are used above. 
The Great Kanawha held its way across Ohio until the 
glacier had advanced to that part of its valley which extended 
farthest to the northward. For a time the waters may have 
skirted the ice-front and recovered their natural channel farther 
