15G 



NEW YORK STATE MUSEUM 



filled by the wash which would have been drifted into it by wave 

 action at its own level. 



Possible local glacier at Port Henry. The presence or absence 

 of local glaciers in the Adirondack* and neighboring mountains 

 of New England continues to be a mooted question. Several 

 writers have reported what has appeared to be evidence of local 

 glaciation following the disappearance of the Laurentide glacier 

 from the Adirondack mountains. Till detailed mapping of the 

 area shall have been undertaken the question is likely to remain 

 more or less open. The importance of the question can not be 

 gainsaid in an investigation of the water levels which have 

 existed in the Champlain valley in view of the possibility of ice 

 dams which may thus have been introduced and maintained 

 after the withdrawal of the Laurentide ice. A few observations 

 of the writer during the present investigation of the foot region 

 of the Adirondacks have prepared him to find that local glaciers 

 may have extended near enough to sea level in the time of de- 

 pression to have interfered w'ith the development of normal 

 shore phenomena, but much more careful work is required 

 before it can be asserted that the phenomena already seen prove 

 the existence of local glaciers. 



The question of local glaciers has been raised in the present 

 survey mainly by the abnormal striation and the lateral moraine 

 terrace at Port Henry and by the faint traces of a late north- 

 south striation about the northern border of the Adirondacks 

 where the earlier. Laurentide ice in diverging lines of flowage 

 moved up the St Lawrence valley on the north of the Adirondacks 

 and up the Champlain valley on the east of this obstruction to its 

 flow. 



Port Henry lies on the western shore of Lake Champlain at 

 the foot of a broad depression in the high hills which confront 

 the lake for several miles on the north and south. The floor of 

 this depression rises westward and expands north and south for 

 a few miles. Still farther westward the ground rises more 

 rapidly into the highest part of the Adirondacks. Along the 

 shores of the lake north and south of this depression roches 

 moutorine'es with rounded northern backs and clifflike southern 

 fronts together with northsouth striation attest the southward 



