WABASH MORAINE. 551 



distinct ridging is more pronounced on the west than on the east side of the 

 Cuyahoga. 



Upon approaching the valley in which Rocky River and the River Styx 

 find a common source, the belt of morainic drift assumes a more subdued 

 expression, its knolls being seldom more than 10 feet in height. The 

 change in topography coincides with a change in structure, the drift being 

 a compact till in the vicinity of Rocky River, while east of that stream it 

 contains much assorted material and its till is quite porous. 



The Wabash moraine is feebly developed on the uplands west of the 

 valley in which Rocky River and the River Styx have their sources, 

 consisting only of low swells 10 to 15 feet or less in height, which are less 

 closely aggregated than in the corresponding portion of the Fort Wayne 

 moraine. In the Chippewa Valley it is also feeble, the knolls being very 

 few and separated by extensive marshy tracts. Similar marshy tracts 

 occupy the low divide between Chippewa and Killbuck creeks. After 

 crossing the headwaters of Killbuck Creek, near Creston, the moraine rises 

 to the uplands and assumes considerable strength, there being sharp knolls 

 25 to 40 feet in height. There are also ridges whose general trend is ENE. 

 to WSW., but which are connected occasionally by cross ridges. The 

 inclosed low tracts contain small knolls. Upon approaching the southward- 

 flowing portion of Killbuck Creek, near Congress, the moraine consists of a 

 single ridge about one-half mile in width, standing 2.5 to 30 feet above the 

 plain on its outer (southern) border. Its crest and slopes have undulations 

 of 10 to 15 feet and there are a few basins along the crest, the deejiest of 

 which are depressed 6 to 8 feet. For a mile or more north of this main 

 ridge there are occasional swells 8 to 15 feet in height, but the greater part 

 of the surface is smooth. 



No trace of the moraine was found in Killbuck Valley east of Congress, 

 but it reappears on the west bluff and passes just north of that village. It 

 there consists of short ridges 10 to 20 feet in height with east-west trend, 

 and knolls of similar height. The moraine enters Lake Fork Valley just 

 above Pleasant Home, and has a well-defined terrace connected with it 

 in which are numerous shallow basins, such as frequently characterize 

 outwash aprons and the heads of moraine-headed terraces. On a western 

 tributary of Lake Fork, in eastern Ashtabula County, west from this place, 

 there is also a moraine-headed terrace. The road from Pleasant Home to 



