358 
Frank Carney 
not complete. As shown by figures 8 and 9 it is evident that ! 
the west segment of this loop is more conspicuously developed, i 
In connection with this fact it may be observed that the east wall I 
of this valley carries everywhere a great complex of drift, so that 
the normal condition of the east segments of nearly all the loops j 
is a lack of distinctness brought about through the massing of I 
drift by marginal drainage. It may be stated further that the I 
material constituting these loops is uniformly more gravelly in | 
the eastern than in the western segment. This fact is especially 
well illustrated in the Groton loop, as here the west segment con- 
sists prevailingly of till in which clay predominates, while the 
east segment discloses a great amount of gravel as exposed where 
cut into by the streets crossing it and passing over it up the slope, 
as well as in the pits that have been opened for road-making 
material, and also in the fact that the village cemetery is located 
on its top. 
‘‘F.’’ Proceeding northward the present valley pinches down 
at the boundary line between Tompkins and Cayuga counties. 
Here the loop (fig. 10) is only less distinct than at Groton, and 
repeats the same arrangement as to the predominating constituents 
in the two segments. The prevalence of clay in the western part of 
this loop is the normal condition of the drift, not only at this point 
in the valley, but for about two miles to the north and rising up 
the slope to the west. On the other hand, the eastern segment 
of the loop, the eastern wall of the valley, and the adjacent uplands 
bear drift in which washed material predominates. 
‘‘G.’’ About three-fourths of a mile southeast of Locke there 
extends out into the valley bottom from the east wall a conspicuous 
ridge of till whose axis of direction is not in harmony with the 
position of a valley loop. That the material is predominantly 
clay, containing many large bowlders, is evidence that the ice here 
maintained for some time a fairly constant position, but the direc- 
tion of the ridge is somewhat puzzling. It may be suggested that 
this particular ridge is the resultant of erosion. If so the reentrant 
angles, particularly on the north side, have lost all evidence of 
stream work such as would suggest this genesis for the axis of the 
ridge. Neither is there a catchment basin, nor at present any 
indication of springs that might furnish the water for the degrada- 
tional work. In this connection it may be noted that just west 
of the present inlet stream and railway there appear beneath the 
