BLANCHAED OR DEFIANCE MORAINE. 587 



it terminates abruptly with sharp knolls 20 feet or more in height. For 2i 

 miles south from this place the spur consists only of a chain of scattering 

 knolls, about one for every one-fourth mile, which follow somewhat closely 

 the range line between New London and Fitchville townships. The knolls 

 are conical hillocks 10 to 30 feet in height, rising abruptly from the plain 

 which they occupy. The spur then assumes greater proportions, and con- 

 tains numerous basins, 6 to 10 feet or more in depth, and winding ridges as 

 well as conical hillocks, the whole surface being undulatory. About a mile 

 to the south it joins the main ridge of the moraine which, in passing this 

 spur, still maintains its distinct east-to-west trend. 



Westward from Vermilion River the moraine for about 7 miles consists 

 of a sing'le main ridge. Its crest is not so continuous nor of so uniform 

 height as east from that stream, and its slopes are dotted by larger knolls, 

 some knolls being 30 feet or more in height, while knolls 10 to 20 feet high 

 are numerous. Basins occur but are not so deep nor so numerous as in the 

 spur east of Vermilion River. The breadth of this portion of the moraine 

 is about 2 miles. North from it the surface soon becomes quite plane. 



In eastern Fairfield Township and in Greenfield and Peru townships, 

 Huron County, in the districts embraced between the east and west branches 

 of Huron River, there is another spur running northward 7 or 8 miles from 

 the main ridge of the moraine. The moraine here embraces nearly all the 

 known phases of morainic topography, a portion of it being a gently 

 undulating swell-and-sag tract, while a larger portion is characterized by 

 sharp knobs and basins; esker ridges also occur in combination with the 

 knolls and basins, and near the northern end of the spur, where the knolls 

 are low and infreqvient, numerous basins occur, while along the south border 

 of the spur there is the till ridge which forms the moraine proper. The 

 southern portion of Greenfield Township presents a swell-and-sag topog- 

 raphy, the swells being 10 to 25 feet in height. The northern portion of 

 this township and adjoining portions of Fairfield and Peru present a sharp 

 knob-and-basin topography, the knobs being 10 to 50 feet in height while 

 the basins range from a foot or two up to 20 feet or more in depth, some of 

 the deepest basins occupying an area of but 1 to 2 acres. 



The principal esker ridge within this spur lies along the " ridge road '' 

 leading south from Norwalk through western Bronson and western Faii-field 

 townships. It extends from the southern part of Bronson Township 



