672 



FRANK S. MILLS 



ing rather than a degrading stream. The rest of the year the 

 volume is extremely small, and the work accomplished propor- 

 tionally slight. Such being the case the main stream, as at 

 present constituted, is doing, and apparently has done, little work 

 of vertical erosion. 



In different parts of the valley, however, are remnants of well- 

 developed terraces of destructional origin, which are out of all 



Fig. 2. — Drift-covered floor of Catatonic Valley, N. Y. 



proportion relative to present drainage conditions. The terraces 

 are not continuous for any great distance, and often are entirely 

 wanting on both sides of the valley. At some time during the 

 preglacial period, and therefore previous to the deposition of 

 drift, the valley was probably drained by two streams ; one flow- 

 ing to the north and one to the south from a common divide. In 

 the lower half of the valley, as one proceeds from North Candor 

 to Catatonk village, the valley grows gradually narrower, and a 

 projection of the valley slopes intersect at a point much nearer 

 the surface of the drift than toward the head of the valley^ 



