Feb., 1907.] 



The Columbus Esker. 



67 



Fig. 1. Chart showing location of the Columbus Esker. The dotted 

 portion sho-\vs 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. 



