ANCIENT WATER LEVELS OF CHAM PLAIN— HUDSON VALLEYS 103 



In front of this ice edge Croton river appears to have entered 

 into the Hudson much as it does now except at a higher level 

 and to have deposited gravels near shore and sands farther out. 

 At least some of these gravels and sands are preserved in the 

 upper part of the Croton point deposit. The only question which 

 arises is whether some of the material may not have been laid 

 down by streams coming off from or out of the ice at this stage ; 

 but the occurrence of these plateaus of gravel and sand along 



^■■:;: : \ De/ta plains of grave/ and sand above with cfay betow. 

 ft&tttA Morainaf deposits of the Croton- Ha.verstra.vv stage . 

 fc frtyf.Al fee -contact sfope at head of deltas. 



Fig. 9 Sketch map of the Croton-Haverstraw stage of ice retreat, with the later 

 North Haverstraw stage 



the ice margin at the points where streams now enter the Hud- 

 son both here and at the mouth of Cedar pond brook appears to 

 be conclusive evidence that much of the work was done by lateral 

 streams. 



Again at Croton point as at Haverstraw the sand and gravel 

 overlie a thick deposit of stratified blue glacial clays, which are 

 well exposed in the pits along the north shore of the point. 



Near the railroad on the north shore of Croton point about 

 20 feet above the beach, coarse glacial gravels with pebbles from 



