VALLEY DEPENDENCIES OF THE SCIOTO ILLINOIAN 
LOBE IN LICKING COUNTY, OHIO 
FRANK CARNEY 
Leverett classifies the drift of eastern Licking County as Illinoian. 
He says: The Illinoian deposits are much heavier in valleys than on 
uplands, and there is a marked sinuosity of margin to conform to the 
topographic conditions.t | The observations described in this paper 
were undertaken in part to give closer definition to the extent of the 
topographic control to which Leverett refers. The paper attempts 
to show that the Scioto lobe on this part of its eastern margin, where 
it reached out over the more rugged topography of the coarser Mis- 
sissippian and Pennsylvanian formations, was affected by valley 
dependencies. It is felt that a detailed study of the marginal areas 
may add to our knowledge of the exact shape of the ice-front at the 
time of its maximum extension. 
MARGIN OF THE ILLINOIAN DRIFT 
In central Ohio.—The general lobation of the Illinoian sheet, 
according to Leverett,? reflects the influence of great basins in the 
topography farther north, the Huron-Erie basin probably controlling 
its extension into the tract now drained by the Scioto River. That 
the extreme reach of the Illinoian ice in the southern part of the state— 
i. e., where it crosses the Ohio River in Brown County—is due to a 
combination of controls, seems likely. 
Fig. 1 gives the results of Leverett’s mapping of the Illinoian ice 
in Ohio. It appears that in one general locality on the eastern side 
of the Scioto lowland the ice manifested a tendency to protrude, as 
is shown by the curve southwest of Muskingum County; another evi- 
dence of this impulse is seen (Fig. 2), just north of this convexity, in the 
valley dependencies reaching beyond the body of the ice-field, 
Glacial Formations of the Erie and Ohio Basins, XLI Monograph, U.S. Geological 
Survey (1902), p. 222. 
2 [bid., p. 226. 
488 
