THE SCIOTO ILLINOIAN LOBE 495 
Moreover, it should be noted that the distribution of the drift in 
this valley does not conform to the pattern usually normal to valleys? 
which encourage tongue-like extensions from the ice border in line 
with the direction of the deploying ice. The east-west valley passing 
Hanover is unusual in that it has a composite history, the most obvious 
feature of which, that it was formerly the course of a west-flowing 
stream, has been published.?, The continuity of the south wall of the 
valley is broken by gaps at A, B, and C (Fig. 3), representing a change 
in the drainage-control of the region; the presence of these openings 
allowed free drainage, particularly in the case of A and C, from the 
southern side of the ice-tongue, thus removing much glacial rubbish 
that otherwise would have remained as a lateral terrace or ridge. 
Furthermore, westward from Hanover the valley grows broader; 
at Newark, a distance of seven miles, it is about two miles between 
the rock walls. Consequently as the margin of the eastern side of the 
Scioto lobe assumed new positions in its decline—a long halt has been 
noted in the vicinity of Newark3—this valley dependency persisted. 
The details of the drift south and southwest of Claylick have been 
studied for two miles, showing that the retreat of the main body of 
the ice was gradual, and apparently maintaining positions parallel to 
the convex margin mapped by Leverett. 
SUMMARY 
A study of the Illinoian drift in this broken topography of the 
coarser-textured and more resistant formations of the Mississippian 
and Pennsylvanian periods establishes the existence of tongue-like 
dependencies of the Scioto lobe reaching out into the eastward- 
trending valleys. 
Re Ssebarr, Bulletins of the Geological Society of America, Vol. XVI (1905), pp. 
218, 219. 
2 F. Leverett, Joc. cit., p. 155; W. G. Tight, Bulletins of Denison University, 
Vol. VIII (1994), p. 47. 
3 F. Leverett, loc. cit., Plate IT. 
