GLACIAL AND POST-GLACIAL HISTORY 463 



points, notably (i) at Crown Point, (2) between the latitude of Hark- 

 ness and the Salmon River, and (3) at Cadyville and westward 

 toward Dannemorra, a moraine or a series of moraines with a 

 peculiar ridge-like topography have been observed on the eastern 

 mountain slope. At two places these moraines are situated across 

 the course of streams in the valleys of which gravel plains occur 

 on the upstream side of the morainic ridges, reaching to the level of 

 their lowest part. The situation is such as to suggest the presence of 

 local lakes in which the gravel was deposited. This point is men- 

 tioned here to call attention to the fact that the ice at this stage, at 

 any rate, and in this part of its front, did not have the same relation 

 to the gravel plateaus as in the upper Hudson, for apparently its ed ge 

 was on the landward side and the body of ice was on the lakeward 

 side. This appears to have been true when the Street Road gravel 

 terrace was made, but where the ice-edge and the body of ice were 

 at Crown Point when the highest deposits of lacustrine origin were 

 deposited is not known. It seems difficult to reconcile the stratified 

 drift, with its eastward-dipping layers, with the position of the ice 

 when the moraine higher up on the mountain side was made. The 

 deltas on the Bouquet River are so situated that it is not necessary 

 to assume either an embayment in the ice-front or a protruding tongue 

 of ice down the Champlain Valley. The possible 580-foot Ausable 

 " delta " may be interpreted with either front. The Saranac high-level 

 delta indicates the presence of the ice at its northern margin, and 

 possibly also at its western margin ; but this delta, if it be a delta, is 

 not well known. 



Below the level of the lowest terrace of the upper series a group of 

 kames which may mark a position of the ice-edge was seen northwest 

 of Peru, and morainic topography was likewise observed one and three- 

 fourths to two miles west of West Chazy, between the upper and lower 

 series of terraces. 



Eskers. — An esker with a length of eight to ten miles, and with a 

 north-by-west and south-by-east direction, is found north of the 

 latitude of Beekmantown,^ and a mile and a half northwest of Tread- 

 well Bay. Its top has a maximum elevation of 240 feet and a com- 



iThis esker was first described by Dr. D. S. Kellogg, of Plattsburg. See Science, 

 June 17, 1892, p. 341. 



