150 NEW YORK STATE MUSEUM 



tliai the water level marked by the delta lies between the 300 

 and the 1^20 foot contour lines. 



The slight development of the Mettawee delta on the margin 

 of the Hudson-Champlain vallo}- as compared with the extended 

 deltas of the streams of similar size today on the south appears 

 explicable in the view that the deposit did not begin to form till 

 the ice which covered the Fort Edward district melted out. It 

 has been shown in the account of the Fort Edward district that 

 there are strong reasons for believing the ice front lay for some 

 time on the south of that district between Fort Edward and 

 Schuylerville. Into the water body covering the clay grounds 

 south of the ice front, the Hoosic, the Batten kill, and other 

 streams farther south were building their deltas and continued 

 so to do while the water was maintained at the level of the 

 delta margins. 



The Mettawee turning northward along the eastern margin 

 of the delta has cut a deep trench into the underlying clays and 

 now flows over the bed rock with low falls about IJ miles below 

 North Granville. 



The delta of the Mettawee correlates with the inclined water 

 plane of a glacial lake at the Coveville stage, as shown on 

 plate 28. 



Delta of the Poultney river at Fairhaven Vt. The Poultuey and 

 Castleton rivers join near Fairhaven Vt on a broad gravelly 

 plain overlying glacial clays. This plain has an elevation of 

 about 380 feet. It is inclosed, except for a pass on the west 

 followed by the Rutland branch of the Delaware & Hudson Rail- 

 road and on the north by the valley through which the Poultney 

 escapes, by high land, and thus appears not to have been a delta 

 built on the margin of an open sheet of water as was the case 

 witli the deltas of the ^lettawee and other streanis on the south. 



The delta of the Poultney lies between the more marked levels 

 of the tilted water planes which converge on the outlets of a 

 glacial lake below Fort Edward. It would appear therefore to 

 have been made in a narrow valley opening westward on a 

 glacial lake. Much more detailed work will be required in order 

 to correlate satisfactorily these dejiosits on Ihe Vermont side 

 of Lake Champlain. The surface of the deposits at Fairhaven 



