ANCIENT WATER LEVELS OF CII A M PLAIN— HUDSON VALLEYS 109 



now do in the fiords of Norway and West Greenland. The destruc- 

 tion of the slope of the terrace facing the river has removed the 

 evidence which a former contact with an ice sheet or glacier would 

 have left on the river margin of the deposit. 



Terrace in PcekskiU. The Hudson river winding through, the 

 Highlands approaches the southern edge of this broad northeast 

 and southwest group of high ridges on a southeast course. No 

 sooner is the river out of the mountains than its course bends 

 sharply at first to the southwest then more nearly south. At the 

 point where it escapes from the Highlands, Peekskill brook de- 

 scending from the northeast finds its way into the main stream, 

 making a small cove about a mile in length and J mile wide deeply 

 sunk into the old rock terrace. Between the city of Peekskill 

 on the south and this creek or cove on the north stands a hill of 

 rock rising to a little less than 400 feet. From the landing in 

 Peekskill one may go around the southern and eastern sides of 

 this hill into Peekskill brook valley by passing over a divide at 

 about 170 feet. From the east a small brook now coursing 

 through Peekskill falls into the Hudson at the southern base of 

 this hill. On the southern slope immediately overlooking the 

 river front at the southern end of a lofty ledge of bare rock which 

 forms the western face of the hill is a glacial terrace with a delta 

 structure. Well defined foreset beds below dip toward the river, 

 and topset beds above incline very gently in the same direction. 

 The surface of this deposit is at about 100 feet above the sea level. 

 Its existence at this point indicates a stream carrying gravel and 

 sand into the Hudson gorge along the south face of the hill. The 

 deposit probably originally extended southward across the de- 

 pression by which the little brook finds its way through the lower 

 part of Peekskill, for on the south side of this valley there is a 

 somewhat sloping terrace now at the same level occupied by resi- 

 dences. 



There is no evidence clearly bearing on the relations of this 

 deposit to the last remnant of ice in the Hudson river, for its 

 river edge has been destroyed ; but it is evidently a deposit made 

 during this early stage of the ice retreat. 



Peekskill creek terraces. In the valley of Peekskill creek, sev- 

 eral deposits practically at the same level between 100 and 120 

 feet in elevation occur on the north and south banks of the cove, 



