MARGINAL GLACIAL DRAINAGE FEATURES 545 



Hollow and flowed as a single large stream, southward and south- 

 eastward to the foot of the hollow where it emptied into a marginal 

 lake held up by the ice of the Seneca valley tongue. 



Fig. 9. — ^Johnson Hollow Channels. The probable position of the ice at the time 

 the channels and delta were forming is shown by the ruled area. The Watkins Lake 

 outlet begins at the base of the hill near the southeast corner of the map. Scale 1/62,- 

 500. 



Four of the channel types, marginal, lateral, morainic, and lake 

 outlets, are represented in this series. Channel B, at the beginning, 



