7 ° 
The Ohio Naturalist. 
[Vol. VII, No. 4, 
To the north and east of this ridge the plain is higher than to 
the west. Upon this higher ground the till is very thin if not 
almost entirely wanting. So sparse is it that it is hard to say 
where the till leaves off and the residual soil begins. Large 
bowlders or erratics, however, are sparsely strewn over the sur¬ 
face. Several large ones lie in Neil’s Run immediately north 
of the ridge. One of these is about 6 by 8 feet. To the west and 
south the till, much of it stratified, increases very rapidly in 
thickness. The record of the State House Well shows it to be 
123 feet ( 8 ), while another well drilled on the banks of the Olen- 
tangy River in the city limits passed through 104 feet of drift ( 9 ). 
Not only is the till much thicker but the large bowlders are 
much more numerous. These occur on the surface at frequent 
intervals and are smoothly worn. 
Fig. 6. A portion of the cross section on the south side of Sixteenth 
Avenue. 
Other instances of water-deposited glacial material occur 
within the city limits. The excavation for the present Chemis- 
trv Building on the State University Grounds, directly west of 
this esker, showed deposits of the finer water-assorted material. 
These occur in alternate strata of coarser and finer drift in which 
8. G. S. O. Vol. I. Part I. pp. 113-114. 
9. Ibid, Vol. VI. p. 282. 
