IGO 



NEW YORK STATE MUSEUM 



thickly set striae and the discrete evidently later glaciation is 

 so great that it hardly appears probable that the two sets per- 

 tain to the movements of the same glacier even when account is 

 taken of divergent flowage in a retreating ice lobe. In the case 

 of the abnormal striation in the northeastern corner of the 

 Mooers quadrangle, it is conceivable that the ice when it had 

 become so thin as to be diverted by the Covey hill ridge, on the 

 east of this elevated district turned more sharply than before 

 into the Champlain valley; but the striae north of Ellenburg 

 depot can not be so explained. The cases above cited recall 

 the later separate striae described by Chalmers as occurring 

 south of the St Lawrence near the international boundary 

 opposite Vermont and New Hampshire and which have been in- 

 terpreted by him as produced by local glaciers descending the 

 mountains along the frontier of New England into Quebec. As 

 yet no evidence of associated frontal moraines nor the northward 

 transportation of erratics which would corroborate this view has 

 been detected along the northern border of New York. Much 

 further work in this region will be required to demonstrate the 

 precise nature of these anomalous striae. 



Southern slope of Rand hill and Dannemora mountain. A rela- 

 tively late stage of frontal deposits is well developed along the 

 southern slope of Rand hill and Dannemora mountain w 7 here 

 the drift is very thick particularly opposite the notches opening 

 northward through the mountain. The ice pressing against the 

 northern side of these elevations appears to have pressed through 

 the valleys and built up a shelving terrace of interstratified till 

 and washed gravels on which the tongues of the glacier at times 

 rested. From the evidence of heavy deltas between Dannemora 

 and Lake Champlain there appears to have been standing water 

 in this embayment at levels above that of the main body of water 

 which later lay in front of the ice over the Champlain valley 

 proper. Such is the delta at Cadyville on the Saranac. 



Moraines north, east and west of Rand hill. Rand hill as 

 shown in the report on the Mooers area [N. Y. State Mus. 

 Bui. 83] is encircled with lines of retreatal moraine on the east, 

 north and west [see pi. 17]. These moraines with the exception of 

 a lower group to be more particularly mentioned show no signs 

 of wave action or of attendant outwash plains constructed in 



