REPORT OF THE DIRECTOR AND STATE GEOLrOGIST 1900 rll9 



^re liable to be weak or eyen wanting where we know tliat deep 

 waters stood for ages. 8) Allowance must be mad^ for the 

 -erosion or weathering, since the producing agencies were 

 withdrawn. 



High channels leading east toward the Mohawk 



Origin and location. During the life of the local glacial lakes 

 -described in the preceding pages the Mohawk valley wasi cleared of 

 the glacier, at least sufficiently to permit free drainage to the sea, 

 and these local valley lakes were at liberty to overfloweast instead 

 of south as soon as the passes across the ridges were opened. Such 

 ieastward flow was eventually certain, but it did not occur till the 

 receding ice front had uncovered the north ends of the intervalley 

 ridges, as the latter are higher than the cols at the southern ends 

 of the valleys. i ^i 



At the north point, or brow, of each great ridge we find a series 

 of terraces and channels cut into the rock by the swift flow of 

 escaping waters. There are six groups of these high channels, 

 and they will be considered in order from west to east. The 

 reader should have before him the following four sheets of the 

 topographic map, Syracuse, Tully, Ohittenango, Oneida. 



1st group. The most westerly group of high channels lies at 

 the north end of the ridge which forms the east side of the Onon- 

 daga valley, 4 mdles southeast of Syracuse and close to Jamesville. 

 They have already been described,^ and can be located by the con- 

 touring on the bottom edge of the Syracuse and the top edge of 

 the Tully sheets. 



2d group. This group lies between Jamesville and Manlius vil- 

 lages, on the slope of the ridge between Butternut and Limestone 

 creeks. The channels may be located on the same topographic 

 ^sheets as group 1, and they have also been described in a general 

 way. (References asi above) 



3d group. The channels of this group lie on the north slope of 

 Eagle hill, between Limestone and Chittenango creeks, and south- 

 east of Chittenango village. They are located on the lower edge 



^ Geol. soc. Am. Bui. 10:54, 60-61, pi. 3, 7-9. 

 Am. jour. sci. 7:251, 262, pi, 6. 



