within a Narrow Area. 163 



in the region of the present headwaters. The series of 

 marginal channels, on Davies Hill, to which allusion has 

 been previously made, would indicate that at all 

 stages of the ice occupation of the Gravel Creek Valleys 

 drainage from the north made its escape to the south- 

 ward around the ice lobe and into the upper portion of 

 the Owego Creek Valley (0', fig. 2). Thus the evidence 

 adduced seems to support for the first part of our -con- 

 clusion, namely that West Sixmile Creek was at an 



Fig. 4. 



Fig. 4. Cross section between summits of Eowe and Cole Hills, along 

 line L-W (fig. 2) to show modification by drift filling of preglacial valley 

 bottom, e, Moss Creek; b, Moss Creek Terminal Moraine; c, West Sixmile 

 Creek. 



earlier date excluded from the lower preglacial portion 

 of its valley (represented now by the Gravel Creek Val- 

 ley) by a moraine deposit, was turned aside and forced 

 to cut a gorge along its new course. 



II. THE SIGNIFICANCE OP THE GORGE OF WEST SIXMILE 



CREEK. 



The gorge of West Sixmile Creek begins about 150 feet 

 above the point of confluence of that stream with East 

 Sixmile, and at a level of at least 90 feet below the 

 surface of the local glacial drift cover (H, fig. 2). Above 

 the point of confluence the tops of the gorge walls on each 

 side of West Sixmile slope very abruptly westward and 

 disappear beneath the drift. The remainder of the 

 ravine, as far as Van Pelt's, lies entirely in drift and 

 nowhere is the bedrock visible in this upper section. A 

 continuation beneath the drift of the westward slope of 

 the tops of the gorge walls suggests that, at the head of 



