REPORT OF THE DIRECTOR AND STATE GEOLOGIST 1900 rl25 



sheet) with a small ravine running southeast down the east slope. 

 The next channel ended on the northeast slope in two short gorges 

 side by side. The lower channels are in shale. The contouring 

 is fairly indicative of the channels. 



Deltas 



Considering the large amount of excavating done by the swift, 

 plunging streams, the delta deposits are few, practically none for 

 the higher channels. The reason® which occur to the writer for 

 this lack of delta deposits with the higher channels are, 1) the 

 absence of quartzose rocks to furnish undecomposable material, 2) 

 the soluble or decomposable character of the involved strata 

 (shales and limestone) and 3) the steep, high slopes preventing 

 local accumulation. The debris was carried down to fill the val- 

 leys, where it was worked over by the present streams, and ha® 

 been widely spread along the border of the lowland north of the 

 ridges. This material came largely within the reach of the 

 waters of Lake Iroquois, and now constitutes the leveled filling 

 of the plain between Syracuse and Oneida, traversed by the lines 

 of railway. 



The most notable delta associated with the higher channels is 

 the one above mentioned at Perryville, J mile southwest of the 

 village, at about 1200 feet altitude by the map {see p. 124). It is 

 not a large delta but conspicuous, seen from the north, and is sig- 

 nificant as marking a local water level, and thus helping to 

 unravel the history of the glacial waters. A broad delta lies at 

 the north foot of Eaton hill, with a hight of 900 to 920 feet, by 

 the map (pi. 36). 



The largest delta seen by the writer in the district lies south 

 of Oneida village, beginning about 1 mile south of the village and 

 stretching southeast for 2 miles toward Kenwood (Oneida com- 

 munity). The remnants of the delta cover perhaps 2 square miles. 

 The New York, Ontario and Wicstern railroad runs along the 

 northeast foot of the delta all the way from Oneida Castle to 

 Kenwood. The summit of the eroded plateau, as given by the 

 map, is 640 feet. This delta is the accumulated debris from the 



