74 H. L. FAIRCHILD — ICE EROSION THEORY A FALLACY 



is then studied at length. It is shown that the valleys of the Finger 

 lakes were never occupied by stream or alpine glaciers, but only by 

 lobations of the ice-front during the advance and retreat of the Lauren- 

 tian ice body ; that the flow of the ice was against the slope, or uphill, 

 and during the most forceful stage was oblique to the valleys; that the 

 lower ice was probably stagnant ; that erosion was unlikely in front of 

 the zone of deposition on the north ; that the convex profiles of the val- 

 ley walls prove the lack of valley widening, and that other features 

 help to a theoretical conclusion adverse to ice erosion. Direct positive 

 proofs of non-erosion are then presented in the existence in the valleys 

 of remnants of preglacially weathered rock. The history of the valley 

 formations and their later hydrography is then briefly outlined. 



