within a Narrow Area. 161 



cated spur of Davies Hill (P', fig. 3) indicate that the 

 general direction of the local ice movement was from the 

 west and southwest. The position of the numerous 

 stadial and lateral moraines and the marginal and out- 

 flow channels denote that the retreat by melting was bach 

 over a route in the opposite direction. 



Interpretation of the Preglacial Drainage Conditions. 



The following interpretation of the preglacial drainage 

 conditions of the Upper Sixmile Valley region is based 

 upon detailed field studies. These have resulted in the 

 collection of data, which logically arrange themselves 

 into the following captions : 



I. The Features of the West Sixmile and Gravel 



Creek Valleys. 

 II. The Significance of the Gorge of West Sixmile 

 Creek. 



III. The Relations of Moss and Spring Creeks and 

 Rowe Hill. 



IV. The Evidence of East Sixmile Creek and its 

 Tributaries. 



I. THE FEATURES OF WEST SIXMILE AND GRAVEL CREEK 



VALLEYS. 



That West Sixmile has been turned from its normal 

 course has already ben suggested. The presence of the 

 massive moraine deposit (the Moss Creek Moraine) lying 

 between Rowe and Gilbert Hills, the abrupt diversion of 

 the stream at this point, and the gorge eroded below Van 

 Pelt's (P, fig. 2) all substantiate this view. Moreover 

 the obvious correlation of the Gravel Creek and West 

 Sixmile Valleys impresses one as strongly in the field 

 as does the manifest disconnection between the latter 

 and the main Sixmile Valley, below Spring Creek. 



Gravel Creek Valley is an early mature, preglacial val- 

 ley filled with drift. At the point where the road trend- 

 ing southwest from Van Pelt's surmounts the first 

 prominent ridge of the Moss Creek Moraine the top of 

 the deposit attains a height of at least 85 feet above the 

 level of the creek, and at Van Pelt 's a well sunk virtually 

 at the creek level extends downward for a distance of 

 about 20 feet before the bed rock is encountered. From 

 this we may safely assume that the depth of the Moss 



