Art.viii.} Davis, Drainage Modification. 167 
plain of the creek. A view from the summit of this glacial 
hill at Glenford, looking to the east, shows the valley still occu- 
pied by the creek, which continues to flow in a shallow course 
through an almost level alluvial flood plain. The valley is 
much narrower however than at Thornport and the walls have 
become quite steep. 
East of Glenford a tributary from the north enters Jona- 
than creek. This stream has its source in Hopewell township, 
of Licking county, in the vicinity of Flint ridge. It is a small 
stream flowing in a deep, narrow valley, a form characteristic 
of the many tributaries. 
One mile below Glenford and between the junction of this 
tributary and the town an outcrop of rock projects out from the 
north side of the valley wall. Immediately to the east of this 
rock promontory and on the same side of the valley, a deposit 
of drift material reaches an elevation of sixty feet above drain- 
age. This deposit is composed of stratified layers of fine clays, 
silts, sands, gravel, flint and moranic material. 
The valley of Jonathan creek filled to this level with glacial 
waters, washing with tremendous force against the side of the 
projecting rocks caused an eddy to be formed in the stream of 
glacial waters just below the projecting rocks. In the still 
waters thus produced the clays, sands and glacial gravels, car- 
ried along by the icy torrents, were deposited. The tributary 
from Flint ridge, flowing into this ponded water periodically 
deposited its load of material consisting of flinty gravels, 
thus aiding in building up the accumulation of heterogeni- 
ous material. The interstratification of the local and glacial 
material is well marked. The finer quality of sand from this 
deposit is used by the railroad company in their locomotive 
sand-domes. An excavation has been made into the deposit for 
the laying of a track exposing a fine section. 
On the north, at this point, the valley wall rises to an ele- 
vation of 200 feet. Looking eastward and southward from this 
elevation the view extends for many miles over an apparently 
broad, level cretaceous peneplain ; in reality much disected by 
drainage channels. 
