Bulletin of the Scientific Laboratories of Denison University. 



Vol, XIII. Article IV. September. 1907. 



VALLEY DEPENDENXIES OF THE SCIOTO ILLINOIAN 

 LOBE IN LICKING COUNTY, OHIO.' 



Frank Carney. 



Leverett classifies the drift of eastern Licking- County as Illin- 

 oian. He says : The IlHnoian deposits are much heavier in val- 

 leys than on uplands, and there is a marked sinuosity of margin 

 to conform to the topographic conditions.' The observations de- 

 scribed in this paper were undertaken in part to give closer defi- 

 nition 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 Alississippian and Pennsyl- 

 vanian formations, was affected by valley dependencies. It is felt 

 that a detailed study of the marginal areas may add to our knowl- 

 edge of the exact shape of the ice-front at the time of its maximum 

 extension. 



MARGIN OF THE ILLINOIAN DRIFT. 



/// centra! Ohio. — The general location of the Illinoian sheet, 

 according to Leverett,^ reflects the influence of great basins in the 

 topography farther north, the Huron-Erie basin probably con- 

 trolling 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. c., where it crosses the Ohio River in lirown 

 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 ibhe eastern 

 side of the Scioto lowland the ice manifested a tendency to pro- 

 trude, as is shown by the cur\'c southwest of ^luskingum County ; 

 another evidence of this impulse is seen (Fig. 2), just north of 

 this convexity, in the valley dependencies reaching- beyond the 

 body of the ice-field, described in the present paper. This later 



1 Reprinted from the Journal of GcoJogy, Vol. XV, No. ~y, July-August, 1907. 

 -Glacial Formations of the Erie and Oliio liusins: XI J Monograph, U. S. 

 Geological Survey (1902), p. 222. 

 ' Ibid., p. 226. 



