of the Northern Cat skill Mountains. 



165 



up stream the old gorge is entirely filled with till and blue 

 bowldery clay, the latter apparently water-laid. For a little 

 distance above this the stream is entirely out of its old gorge, 

 and has cut a hundred-foot-deep postglacial gorge. 



A little farther up it again occupies its older gorge. This 

 older gorge, like that of Mine Kill, may, so far as the evidence 

 at hand shows, be either interglacial or preglacial. 



Of the hanging valleys, those of Platter Kill, Manor 

 Kill, and Huntersfield Creek, are most conspicuous. It may 



Fig. 14. 



Fig. 14. Sketch showing relations at months of Mill Creek and West Kill 

 at North Blenheim. 



be, however, that none of them are truly hanging in the sense 

 of having their rock floors out of harmony with that of 

 Schoharie Creek. All may be merely the result of a diversion 

 of the streams from their former courses by the deposition of 

 drift. Of these Manor Kill and Huntersfield Creek present 

 features most typical of true hanging valleys, but in each there 

 is room for a buried gorge to the southeast of the present 

 stream course. 



In the Delaware drainage system (Hobart quadrangle) Pleas- 

 ant Valley Brook* and Montgomery Hollow, both entering 

 the Delaware at Hubbell Corners, are cutting on rock near 

 their lower ends and are probably hanging 100 feet or so 

 above the rock bottom of the main valley. 



A number of small valleys on the north side of the West 

 Branch of the Delaware between South Kortright and Delhi 

 (Delhi quadrangle) are distinctly hanging, but neighboring 



* Von Engeln, private communication. 



