214 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



scarcely 25 miles iu length. The lower courses of these streams appear to 

 be largely independent of pregla 'ial lines. The headwater portions often 

 occupy depressions in the escarpment nearly in line with streams which lead 

 southward from the escarpment. The present divide in these low places on 

 the escarpment is in several cases a morainic ridge, and this apparently lies 

 north of the preglacial divide. 



CONNEAUT CREEK. 



Conneaut Creek has its source in a moraine near Conneaut Lake 

 in western Crawford County, Pa. The headwaters lead down into a 

 broad valley which is continuous with the valley that contains Conneaut 

 Lake and Conneaut outlet, which are tributary to the Allegheny River 

 through French Creek. The course of Conneaut Creek is northward for 

 about 20 miles to a point not more than 10 miles from the border of Lake 

 Erie. It there turns abruptly westward and flows between morainic ridges 

 for a distance of perhaps 15 miles to the village of Kingsville, Ohio, where 

 it breaks through the north morainic ridge and takes a northeastward course 

 to Lake Erie. 



The valley occupied by the north-flowing portion of Conneaut Creek 

 evidently di-ained a basin which was very difi"erent from that of the present 

 creek and which discharged directly northward into the Lake Erie Basin 

 across the northwestern part of Erie County, Pa. The probable extent of 

 the old basin is discussed in connection with the Middle Allegheny. It 

 was thought by Carll that Conneaut Creek constituted the former line of 

 discharge for much of the present drainage basin of French Creek and the 

 headwater portion of Oil Creek. It is found, however, that French Creek 

 crosses two cols in passing southward from Cambridge to Meadville, which 

 necessitates an interpretation different from that given by Carll. Instead of 

 turning southward from Cambridge the old line of discharge for the head- 

 water portion of Oil Creek and much of French Creek apparently was north- 

 westward across Erie County to the Lake Erie Basin, as indicated in the 

 discussion of French.Creek drainage (pp. 138-143). 



The west-flowing portion of Conneaut Creek, being determined by 

 morainic ridges, shows little, if any, dependence upon preglacial lines. 

 It is mainly in a rock gorge, though in places the drift extends below the 

 level of the stream bed After passing through the moraine near Kings- 



