130 H. L. FAIRCHILD 
INTRODUCTION. 
Scope of the paper—The bays of Sodus and Irondequoit are 
the extreme points in the great bight or landward curve in the 
south shore of Lake Ontario. They occupy the lowest points of 
two north and south depressions in the land surface, the effect, 
probably, of northward preglacial drainage, and locate the 
embouchure of the buried ancient channels. 
During the recession of the great ice-sheet, the drainage of 
the comparatively stagnant Ontario lobe seems to have been 
largely determined, in this region, by these depressions, which 
evidently received a large share of the glacial drift. The Warren 
waters which continuously laved the receding ice front assisted 
_in distributing and leveling the detritus, while its successor, Lake 
Iroquois, completed the work at a lower level. The extensive 
silt plains between Sodus Bay and lakes Seneca and Cayuga, and 
the Irondequoit terraces, are examples of such lake action. 
The purpose of this paper is not to discuss the complicated 
and interesting sequence of geologic events in the region under 
consideration, but to describe certain massive deposits of sand 
and gravel apparently formed by the glacial drainage. 
The term ‘kame’ is here used in the sense which has 
become generally accepted, as designating deposits, chiefly sand 
and gravel, having a knob-and-basin topography, and formed 
at the margin or periphery of the ice-sheet. The term “esker”’ 
(osar, serpent-kame) is employed to denote distinct ridges, 
chiefly gravel, believed to have been deposited in the beds of 
subglacial streams, being phenomena of the radial drainage. 
Three of the kame areas here described have been mentioned 
in former writings,’ but a new explanation of their character and 
relations is here given. The Junius area is thought to be here 
*The Glacial Geology of the Irondequoit Region, Charles R. Dryer. Am. Geol. 
Vol. V., p. 202, April, 1890. 
Eskers near Rochester, N. Y. Warren Upham, Proc. Roch. Acad. Science. Vol. 
IL., p. 181, January, 1893. 
The Kame-Moraine at Rochester, N. Y., H. L. Fairchild. Am. Geol., Vol. XVI., 
p- 39, July, 1895. 
