27 
An Esker Group South of Dayton, Ohio 
Kamy area to the west of eskers (figs. I, 5). The kames here 
show a tendency toward alignment in short ridges. Sometimes 
they appear to radiate from a common center. Artificial cuts 
facing the valley show prevailingly fine material indicating by 
the stratification a very active play of waters. 
Studies. 
Proximity of eskers. The distance between the two eskers is 
always slight. The surface outline of this distance is usually 
similar to a parabola shaped trough of such a size that if one of 
the adjoining ridges were inverted it would approximately fit the 
trough. The drainage from the troughs is principally through 
the soil. 
Height of eskers. The variation in altitude of the crestTnes 
and of the troughs gives varying heights at diflFerent points. No. 
2 by aneroid measurement varies from 35 — to 95 + feet in height. 
No. I, if measured, doubtless would give similar results. 
Reticulation. The two eskers show several connecting branches. 
This implies a union between the lines of drainage some time dur- 
ing their existence. These connecting branches are so depressed 
in parts that tracing is difficult. Such a condition would be nat- 
ural as the cross drainage would normally be so sluggish that the 
tunnel carrying it would probably never attain a large size. It is 
a question whether the two eskers represent branches from one 
line of drainage or are entirely independent. They may even 
represent a shifting of drainage lines. The lower end of no. i 
suggests by its position (fig. i) that it may be a branch from no. 2, 
rather than a continuation from the head end of no. i, as we have 
described it. 
Knolls. Hummocks are frequent. Generally they mark the 
southern termini and ridge junctions. At its head end no. 2 is 
composed of a series of four joined together. Many theories^® 
are given for the origin of such swellings. In connection with 
knolls other modifications of the esker type may be noted. Several 
buttress-like deposits were found lying against the bases of the 
J. B. Woodworth, loc. cit., pp. 202, 203. . ' 
