154 Vif Th, JTATMR CJA OLIO) 
Junius post office (Mitchell’s station). It is regarded as mark- 
ing the edge of the ice-sheet during the accumulation of the 
larger kame hills by the concentrated drainage. 
COMPARISON OF THE KAME AREAS. 
It will be instructive to briefly compare the principal features 
of the four large areas described above, including in this com- 
parison the Rochester kame-moraine and some lesser areas. 
The Irondequoit, Victor and Mendon areas are apparently the 
result of heavy drainage from the wasting ice-sheet, concentrated 
along the Irondequoit depression. The neighboring deposits of 
the Rochester kame-moraine and other lesser deposits southwest 
and west of Rochester have an uncertain, if any, relation to the 
Irondequoit drainage. The Junius area is in a separate and dis- 
tinct glacial drainage system, belonging to the Sodus depression. 
The Irondequoit area is singular in one respect; it rests in the 
lowest channel of the depression and partly below the level of Iro- 
quois waters. The other areas are upon relatively high ground and 
constitute the highest points of land in their vicinities and upon 
their respective meridians, north of the Devonian plateau. 
All the areas are alike in being located in the basin of lake 
Warren. Excepting the Junius area they are also alike in bear- 
ing evidence in the beautifully terraced and truncated sand hills 
of their accumulation beneath the Warren waters. Two strongly 
developed water levels are conspicuous; the higher between 850 
and goo feet, the lower about 700 feet above tide. The Junius 
area lies at so low an altitude that the hills have escaped the lev- 
eling action of any long pause of the Warren waters, their sum- 
mits being much below 600 feet. 
The areas are alike in having an overwash sand or silt plain 
to the southward. 
The basement terranes are as follows: The Rochester kame- 
moraine lies upon the southern edge of the Niagara limestone. 
The Irondequoit stretches across the whole breadth of the Salina. 
The Mendon and Junius areas lie upon the Salina but near its 
southern limit. The Victor area lies chiefly upon the Corniferous 
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