Pleistocene Geology of Moravia Quadrangle 415 
the topographic sheet. It is entirely possible that this delta 
started as an alluvial cone, growing rapidly, and that in the shift- 
ing of the ice, a slack or even static condition of drainage developed 
in the rear of the cone; consequently the final deposition of stream- 
load produced the delta effect. 
The well developed delta north of Groton appears to be 
associated in its earlier stages with a partial withdrawal of the 
ice from the west slope of Turkey Hill, thus lowering the outlet 
while still keeping a static body of water, a score or more feet in 
depth, over the normal divide of Fall Creek valley in the region of 
Freeville. But after the ice had retreated sufficiently from Turkey 
Hill to drain Fall Creek valley southwest of Freeville, then this 
latter divide became the overflow channel of the water standing 
in front of the ice in the Groton valley. This spillway is given 
as 1040 feet in altitude. 
‘‘H.’’ With the thinning of the general ice-sheet over the 
Moravia quadrangle the Owasco lobe alone remained, but pre- 
ceding the stage when the area of this sheet bore only remaining 
portions of the Owasco lobe there appears to have intervened a 
period when the eastern flanks of the Cayuga lobe still spread over 
a part of the western area of the sheet. Delta ‘‘H’’ represents 
the withdrawal of the ice from the high area east of Wilson’s 
Corners sufficient to allow drainage from the north an outlet 
between the ice and this slope into the small body of water held 
up in the Morse Mill valley; this delta has a slight areal extent, 
but is typical in the usual delta features. It apparently does not 
represent a long time interval. Its position and development are 
both in accord with the ice-walled channel outlet described south- 
east of Moravia (p. 435). 
‘H. ” This delta at Morse Mill represents a lower level of the 
same slight body of water. Its spillway also was formed by the 
ice and the westward slope of the salient southwest of Moravia. 
^G ” portion of delta ‘‘G” here referred to lies north- 
east of Montville and has a general altitude of 1060 feet. In 
accordance with the distinction made by Fairchild^^ this delta 
represents glacial Lake Groton which overflowed through Fall 
Creek with a spillway at Freeville. The great mass of material 
in this delta bespeaks the vigorous drainage of ice-front streams 
Bull. Geol. Soc. Jm.y vol. 10 (1899), p. 50. 
