4i6 
Frank Carney 
coming from the north* During the formation of this part at 
least of delta the ice of the Cayuga lobe obviously reached 
eastward from Ludlowville covering a later overflow channel at 
North Lansing, covering also the Moravia sheet northward, and 
connected apparently with the morainic belt east of Asbury, 
With this tendency of the ice, it is probable that the duration of 
the Freeville overflow channel was contingent upon the position 
which the eastern margin of this Cayuga lobe maintained in 
reference to the high area south of Asbury, that is, the rock hill in 
the southwest corner of the Moravia quadrangle. When the 
ice crept down this western slope, disclosing a contour lower than 
1040 feet, it is evident that the waters of the glacial Lake Groton 
worked along the edge of the Cayuga lobe and flowed into glacial 
Lake Brookton. The western slope of this hill shows the effect 
of such a spillway. 
As just indicated the water level connected with delta ^^G’^ 
gradually dropped to an overflow of about 1020 feet, which we will 
call the Asbury spillway. In consequence, this delta has a lower 
stage during which it developed westward from the part above 
described; the feeding stream, when the lake-level fell, took a 
course near the western part of the old delta. The difference in 
level between these two parts of this delta is shown in figure 24. 
The highway leading south from Asbury for some distance passes 
over a rock surface from which the normal veneer of drift has been 
largely removed by the outflowing waters of this lower stage. It 
is evident that this relation of ice and topography south of Asbury 
was maintained for considerable time, a position of the ice proba- 
bly marked by drift loops in Fall creek valley on the Dryden 
sheet. 
This delta, meagre in development, apparently also 
represents an overflow by way of Asbury; its altitude is about 940 
feet. Furthermore, at seems to mark the critical stage in the 
history of glacial Lake Ithaca, a stage that immediately preceded 
the formation of Lake Newberry. 'This delta is a short distance 
west of the Lansing overflow channel, and was developed during 
and shortly after the time when static water stood over the channel. 
Its height and areal extent both indicate a brief duration of the 
water body which it is associated with. 
The Locke delta, as already pointed out by Fairchild®® 
Loc. cit.^ p. 50. 
