172 J la us i, i tin — Glacial Modification of Drain «</< 



cut its gorge. Such evidence is actually to be found in 

 the change in the direction of the flow of Berry and 

 Diedrich Creeks, and to a less extent in that of Reed 

 Creek (R', fig. 2). It suggests that preglacially all three 

 may have followed in the entire extent of their courses 

 the directions of the upper portions of their present val- 

 leys and flowed more toward the south, but turned toward 

 the west after the steepening of their main valley (East 

 Sixmile) and flowed down the steepened slopes in, the 

 shortest route to the main stream below. Furthermore 

 in the lower parts of their courses they have all cut 

 diminutive gorges in the bed rock of Davies Hill, and 

 bear all the appearance of streams that have been reju- 

 venated because of the deepening of their main valley. 

 The facts that have been adduced, namely : (1) that Spur 

 Creek has been turned from its earlier course by a mass 

 of moraine, (2) that the Spur Creek Moraine continues 

 up the western side of the East Sixmile Valley and has 

 diverted the stream at the road near the foot of Cole 

 Hill, (3) that the East Sixmile gorge is manifestly cut 

 into the side of Davies Hill, causing the rejuvenation of 

 Berry, Diedrich, and Reed Creeks, all seem to justify the 

 conclusion that East Sixmile Creek has been forced to 

 the eastern side of its old preglacial valley by the Spur 

 Creek Moraine and has, in consequence, been compelled 

 to cut a gorge in its earlier valley wall. 



Summary and Conclusion. 



Upon the facts gathered in the field and outlined in the 

 foregoing pages .the author's restoration of the probable 

 preglacial topography and drainage, as given in fig. 7, is 

 based. 



In fig. 8 is represented the theoretical position of the 

 ice lobe at the time of the deposition of the Moss Creek 

 Terminal Moraine. During this stage the impounded 

 waters from the north flowed around the northern edge 

 of the ice front and escaped southward into the upper 

 portion of the Owego Creek Valley through some one of 

 the marginal channels on the higher slopes of the western 

 side and southern end of Davies Hill. 



At a later stage, fig. 9, the ice had so far retreated that 

 Rowe Hill was uncovered and the occupation of the Moss 

 Creek Outflow Channel commenced. During this period 



