MORAINES OF RECESSION 441 
afterwards existed as the outlet of the glacial Maumee lake. 
The accompanying sketch map shows the relation. Dryer and 
Leverett show this belt on their maps." 
The disposition of this belt seems to show that the ice-front 
had retreated at least to Fort Wayne from the moraine next 
west of the bowlder belt in Whitley county, and halted while 
the large river excavated a channel about where the present old 
outlet bed is between Fort Wayne and Huntington. Then by a 
readvance the bowlders which had been left in this bed were car- 
ried forward by the ice, which moved ina direction normal to 
the ice-front, but diagonally across the river bed, and deposited 
them in the Whitley morainic bowlder belt. If this took place, 
then it is plain that the ice-front had retreated to Fort Wayne 
and that it readvanced over more than half the space it had just 
uncovered at the preceding retreat which was, therefore, not less 
than thirty miles.’ 
This interpretation of the Whitley belt is not yet a sure 
inference, for further and more particular investigation will be 
required to fully verify or disprove it. The Montgomery-Ben- 
ton county belts seem to be somewhat similarly related to a 
readvance over a part of the Wabash River bed, and pos- 
sibly to a former river bed about where Wild Cat Creek is 
now, and the Iroquois belt may have had a similar relation to 
the Tippecanoe River or to a glacial river that crossed from the 
Kankakee to the Wabash farther west, but was obliterated by 
the readvance. 
DRYER in 18th Report of Indiana State Geologist, 1894, p. 84. LEVERETT in 
the ‘“‘Inland Educator” (Terre Haute, Ind.), for August 1896, opposite p. 24. DRYER 
shows only that part of the bowlder belt which lies in Whitley county; LEVERETT 
shows it extending on southward nearly to Huntington. The accompanying sketch is 
compiled from their maps. 
2 The range or amplitude of oscillation may have been considerably more than 
thirty miles. Indeed, after the ice-front left; Fort Wayne it must have been greater, 
for the four intervals from this place to Port Huron are almost exactly fifty miles each. 
The amplitude of oscillation was probably twice this or a little more — 100 miles or 
over—if the Whitley bowlder belt can be relied upon to indicate a readvance from 
Fort Wayne. The probable cause of the difference in amplitude east and west of 
Fort Wayne will be discussed later on. 
