164 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



rock floor. This valley seems to have drained northward either to Rocky 

 River or the Cuyahoga, passing near Sterling. The vtrriter is inclined to 

 favor the view that this valley had a course eastward from Sterling to 

 Warrick, and thence north past New Portage and Copley Marsh into the 

 old Cuyahoga, that being a larger valley than the old Rocky River Valley. 

 Todd, however, favors Rocky River Valley as the line of discharge into Lake 

 Erie. The valley under discussion, with its deep filling of drift, shows gen- 

 eral eastward descent, as indicated in the table below. The available data 

 concerning the rock floor shown in the table, though meager, also favor the 

 view that it slants eastward. It furnishes a more natural trunk line than 

 any other old line of drainage yet found in that region. The several tribu- 

 taries of Mohican Creek converge toward this old valley, and seem to find 

 in it a natural line of discharge. This old line may properly be termed 

 the old Mohican. The table presents the railway stations ui order from 

 west to east between Mansfield and Wooster, showing elevations of the 

 present surface and rock floor so far as known. The borings at Millbrook 

 and Wooster fail to reach rock at the altitudes given. 



Altitudes above tide along tJie old Mohican d/rainage. 



Mansfield... 



Lucas 



Perrysville . 

 Loudonville 

 Lakeville . . . 



Shreve 



Millbrook ., 

 Wooster 



Distance 

 from Mans- 

 field. 



1,151 

 1,090 

 992 

 974 

 939 

 911 

 900 

 901 



Feet. 



900 

 (?) 

 (?) 



825 



(?) 



(?) 

 715- 

 790- 



Black Fork now turns south from this old valley at Loudonville, and 

 passes through a range of hills to join Lake Fork. Lake Fork passes 

 across the old valley at Lakeville, and discharges through a much nar- 

 rower valley toward the south. It seems probable that an old divide which 

 separated this drainage system from the east fork of the old Owl Creek 

 drainage was crossed just below the junction of this old valley and Black 

 Fork. For a few miles north of Lakeville Lake Fork is in a broad valley, 



