Feb., 1907.] 
The Columbus Esker. 
67 
r 
Fig. 1. Chart showing location of the Columbus Esker. The dotted 
portion shows where the ridge has been eroded by a small branch of Neil’s 
Run, Seventeenth Avenue occupying the position of this branch. 
Fig. 2. General view of the esker from a point near Seventeenth 
Avenue looking north. The shed is located upon the center of the ridge 
just north of Eighteenth Avenue, where there is a sharp turn to the east 
and thence northward. 
