of the Northern Catskill Mountains. 



155 



here recorded in the hope that they may be of assistance to 

 future investigators. 



What appears to be the clearest case of local glaciation is 

 that at the head of Fly Brook, described by the writer in 

 1906. * A subsequent examination of this locality served only 

 to confirm the results of the first visit. 



In Montgomery Hollow, over the mountain immediately 

 west of the Fly Brook locality, are three strong morainic loop's 

 pointing westward down the valley. These may represent the 

 work of local glaciers, or they may have been formed by a 



Fig. 7. 



Fig. 7. Sketch showing relations in the gap at head of Montgomery 

 Hollow. 



tongue of ice from the Schoharie lobe pushing through the gavj 

 from the valley of Fly Brook previous to the formation of the 

 local glacier in that valley. 



The notch between the valley of Fly Brook and Montgomery 

 Hollow presents several interesting features whose explanation 

 has not yet been worked out. The conditions are sketched in 

 figure 7. The eastern end of the pass is banked with moraine. 

 At the divide within the pass, on the south side of the road, 

 and higher than the moraine, is a sharply cut gorge leading 

 eastward, separated from the main notch by a rock island. 

 Just west of the divide is a deep rock gorge opening westward 

 and overshadowed on the north by sheer cliffs some 200 feet 

 high. Evidently the pass was occupied at different times by 

 glacial outflow streams. The determination of the exact rela- 

 tionship of these outflow channels may throw light on the 

 question of the origin of the Montgomery Hollow moraines — 

 whether local or not. 



*Jour. Geol., xiv, 113-121,. 1906. 



