588 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



southward about to the east-to-west center road in Fairfield Township, a dis- 

 tance of 3 miles. Its height ranges from 10 up to 50 feet, or even more. 

 Its breadth, including slopes, is 75 to 125 yards. It presents, therefore, very 

 abrupt slopes. There are occasional short spurs running out from it, and at 

 its southern end there is a plexus of sharp, esker-like ridges, 40 to 50 feet 

 high, inclosing basins 20 to 30 feet in depth, the system occupying a breadth 

 of one-fourth mile or mOre. It is bordered on each side throughout its 

 entire length by the knolls of the morainic spur, and its surface in places 

 has hummocks of drift plastered onto it which, when numerous, cause it to 

 resemble a moraine more nearly than an esker. These hummocks on the 

 esker ridge contain poorly assorted material together with small amounts 

 of till, features which indicate glacial deposition rather than fluvial. The 

 features suggest that the material forming this esker was laid down by a 

 stream flowing beneath the ice sheet, and that the englacial inaterial was 

 subsequent!)^ left upon it in irregular deposits as the ice sheet disappeared. 

 In Grreenfield Township, in the vicinity of the middle branch of Huron 

 River, there are short esker ridges one-half mile or less in width, having 

 either a north-to-oouth or a nortlieast-to-southwest trend. 



North of Macksville, among the low swells, are basins, which range 

 in depth from 8 to 15 feet. Topography of this character extends to the 

 upper beach of Lake Maumee, and probably extended slightly farther north 

 before the beach was formed, there being in northern Peru Township 

 occasional basins just north of the beach line; they do not, however, extend 

 a mile beyond the beach. The knolls, if present in that district, have been 

 entirely obliterated b)" the lake waves, so that with the exception of these 

 basins the morainic features appear to terminate at the beach line. In the 

 western part of Peru Township the beach follows the northwest bluff of 

 Huron River and has sandy knolls 10 to 20 feet in height associated with 

 it. It is possible that these knolls are of glacial origin, though it seems 

 probable, from their restriction to the borders of the beach, that they 

 received their sand from the glacial lake. The cause for the development 

 of this prominent spur has not been determined. 



I'he main ridge continues westward past the southern end of this spur, 

 its crest being about a mile south of Chicago Junction. It is here decidedly 

 billowy, with immerous swells 10 to 20 feet high, but within a mile west of 

 the meridian of Chicago Junction it loses its sharply morainic expression 



