GLACIAL AND POST-GLACIAL HISTORY 443 



The phenomena in Division 2 are somewhat hke those from south of 

 Peekskill toward Oscawanna, and indicate the presence of the ice in 

 the valley near the north edge of the terrace when the deposits found 

 here were being made. The Carthage Landing-Lowpoint and 

 Roseton deposits indicate the presence of the ice -in the valley when 

 adjacent stratified drift at higher levels was accumulating. The 

 New Hamburg gravel plateau and Wappinger Creek stratified drift 

 indicate the presence of the ice in the valley at the edge of the New 

 Hamburg plateau while the ice in the higher lands was retreating 

 through the Wappinger Creek Valley. 



I. NEWBURG-NEW WINDSOR AND FISHKILL-DUTCHESS JUNCTION. 



These places are situated on opposite sides of the river. On each 

 side the Haverstraw phenomena are 1 epeated. Gravel plateaus under- 

 lain by clay are situated next to the river, and morainic phenomena 

 occur on the higher land away from the river. The gravel plateau 

 at Newburg is more delta-like in form than either at Haverstraw or 

 Fishkill-Dutchess Junction. (See Fig. 12.) In the latter places the 

 surface is marked by undulations similar in kind to, but more sub- 

 dued than, those in the moraines on the adjacent higher land. 

 Masses of till are found at Dutchess Junction in the clay, and ripple 

 marks are found in the clay at New Windsor. (See Fig. 3.) 



Interpretation: The interpretation of these deposits is similar to 

 that of the Haverstraw deposits. It is difficult to see how the ice of a 

 single ice-lobe can retire from a valley both to the eastward and to 

 the westward, either simultaneously or successively, unless it be by 

 the making of an embayment in its front. The evidence here, like 

 that at Croton Point and Haverstraw, points to an embayment of the 

 ice-front with at least wings of ice extending farther down the Hudson 

 on each side. If the interpretation of the Jones Point, Roye Hook, and 

 West Point- Cold Spring phenomena be correct, it would seem that 

 the front changed from .a protruding tongue in the Highlands and 

 immediately south, to an embayment at Newburg — New Wind- 

 sor and Dutchess Junction — Fishkill. This is similar to the inter- 

 pretation of a protruding ice tongue south of Croton Point and 

 Haverstraw and an embayment at those places. 



The level to which the waters of the Hudson water body reached 



