REPORT OP THE DIRECTOR AND STATE GEOLOGIST 1900 rl35 



faint slope of the present valley bottom is probably due to the 

 stream deposition, which probably has here far more than 

 counteracted, for the valley slope, the degree of tilting. More- 

 over, the position of the lakes would seem to fix the place of 

 the water parting as having been originally where it is now. 

 But the poseibility of a changed position of the water parting by 

 tilting of the land surface should be considered in other cases. 



Another explanation of the lack of channels in the divide drift 

 may be that at the time when some new and lower outlet was 

 •opened for the lake, and this outlet ceased to be effective, the 

 wasteweir or intake gf the channel was choked with berg ice and 

 frozen drift, through which or over which the overflow passed. 

 This condition would not be so likely to occur in the case of a 

 large lake which would require a long time, many years perhaps, 

 lor the old outlet to be wholly abandoned, even after the new 

 one was opened. It would seem as if ice-obstructed channels 

 would be more likely with smaller lakes, like those we are now 

 considering. 



Cols which were water channels are found along the divide in 

 central-western New York showing every gradation from broad, 

 open channels, like the Burns channel above Hornellsville, that 

 has every character of river work, to those which look as if even 

 a brook had never flowed across. And of the several features 

 pertaining to the cols all combinations may be found, due to their 

 relative development or absence. In the district of our present 

 study there is a striking succession of these peculiar cols and 

 filled valleys, indeed they are the most conspicuous features on 

 the four topographic sheets. In order from west to east, they 

 are the two inlets of Chautauqua lake, Bear lake outlet, Cassa- 

 daga creek, west and north branches of Conewango creek, and 

 Slab City creek. 



Glacial lakes 



Farrington hollow lake. The finest abandoned channel seen 

 by the writer in the district is one that does not lie on the divide, 

 but which occurs at the head of a north-sloping valley far south 

 of the divide. Farrington hollow {see the Cherry Creek sheet) is 



