FOURTH REPORT OF THE DIRECTOR I907 2^ 



at and south of Northville. Most of Northville village lies upon a 

 flat table which is a remnant of this delta. The delta can be traced 

 for about a mile north of Northville heading against the great 

 recessional moraine to which reference has already been made. 

 South of Northville it has been largely dissected and much of it 

 swept away by the Sacandaga river. Slight remnants are seen on 

 the east of the river but the major parts of it are on the west. Be- 

 ginning with the flat sandy area on which the resort known as 

 Sacandaga Park is situated and extending southward to a point 

 eastward from Cranberry creek and past Ogden's creek toward 

 Northampton some small areas of till emerge from the silts of the 

 delta near its edge and from Sacandaga Park to Osborne's bridge 

 much of the old delta area is occupied by terraces and flat plains 

 and old channels of the Sacandaga river. 



Lake deposits of the Mohawk valley. These include conspicuous 

 deposits of sand, silts, clay and gravel at altitudes varying from 

 440 to ^60 feet, in some cases a little higher. These are found 

 about the Lower Cayadutta and west of Fonda. They extend from 

 Fultonville to the Schoharie creek south of the river. They are 

 found conspicuously along the north side of the river and east and 

 west of Tribes Hill. They also appear at the golf grounds of the 

 Antlers Club and along the river on the north side of Amsterdam, 

 and easi and west around Port Jackson. These deposits are con- 

 spicuous and they are to be seen at Hoffmans Ferry. In the great 

 delta on the north side there are minor exhibitions of them south- 

 eastward to Rotterdam or a little beyond. These silts and sands 

 evidently represent waters at an altitude of from 440 to 460 feet 

 and the determination of a barrier by which such waters should be 

 maintained has been one of the most puzzling questions of the in- 

 vestigation. No entirely satisfactory answer is at hand, but it is 

 the best belief of the writer that the barrier was ice in the vicinity 

 of Schenectady. It is not necessary to believe that the entire strip 

 of the valley from Schenectady westward was in the earlier stage 

 occupied by these waters continuously, for at some points in the 

 vicinity of Amsterdam, for example, there are the accustomed clays 

 containing scratched stones and there are sands and gravels of 

 such irregular character as to lead to the conviction that the waters 

 in which they were deposited were in the immediate presence of ice, 

 which could have been no other than a local remnant ice ton^^^ue 

 extending up the valley from the main glacier which still lingered 

 in the region of the middle Hudson. These deposits at similar 



