An Esker Group South of Dayton, Ohio 
33 
1. These eskers conform in details to the type generally con- 
ceded to be of sub-glacial origin. 
2. Their location was largely dependent on topography, lying 
as they do in a position favoring active sub-glacial drainage. 
3. The heavy stratified glacial deposits other than eskers also 
indicate an activity of drainage beneath the ice or from its front. 
4. The varying texture of the bowlders suggests a reworking 
of old glacial debris by the last ice-sheet. 
5. The inexhaustible supply of gravel and sand offered, together 
with convenient location and easy access, give the area considerable 
economic value. 
Geological Department, Denison University, November, 1907, 
