28 
Earl R, Scheffel 
eskers; sometimes also a fan-like spreading of debris from a simi- 
lar position was observed. These irregularities probably mark 
the entrance to the major line of small tributary streams^ or as an 
alternative^ the opposite condition, leakage from the -major lines. 
The knolls at the head of no. 2 are more suggestive of tributaries 
than of kames. 
The knoll-endings (figs-, i, 6) on the Miami Valley suggest by 
their alignment that they have been cut off at this point by the 
Miami River. Though this stream here turns to the westward, 
the even floor of the valley is evidence that it formerly turned east- 
ward. The fanning of the knoll-endings into the valley where 
Fig. 4. (F. Carney). Camera reversed from fig. 3, and view taken looking 
south on same esker, 
they meet in an even slope is doubtless the result of slumping. 
Davis^i gives a clear exposition of conditions when bodies of water 
are dammed by the ice-front, with the consequent phenomena 
of sand plains built up by esker streams. The Dayton area, how- 
ever, shows no evidence of favorable conditions for the holding 
of ice-front waters, drainage having a perfectly free course toward 
the south. Streams emerging from the ice would spread out and 
quickly drain away. In this particular area such an outwash 
plain if formed would have been destroyed long ago by the erratic 
wanderings of the Miami. 
W, M. Davis, Bull. Geol, Soc. Am.^ vol. i (1890), pp. 195-203, 
