A Strati graphical Study 
133 
aggraded with outwash, which has been terraced in places. In 
cross-section^ these segments have a less aged appearance than 
their flood-plain portions indicate. The two coarse, somewhat 
resistant formations, the Sharon and the Black Hand, have 
retarded the usual effects of lateral planation work. .The valley 
dependency of ice which extended eastward from Wilkins’ Cor- 
ners built a moraine ridge'^ across the old valley where it turns 
northward. This ridge blends into outwash which is terraced for 
miles southward. 
Many other instances of capture, supposed to belong to the 
same aggressive movement of the south-flowing streams, have 
been studied, but not much has been published concerning them. 
c. (i) Under normal conditions of stream capture the more 
speedy cutting down of the rock beds insures good exposures for 
stratigraphical study. The abnormal conditions in the area at 
hand is that whatever progress the streams thus made in degrading 
their beds was partially obliterated by the aggradational work of 
the ice-front drainage. The great distances over which the wash- 
material from the ice-front has been spread in eastern Licking 
county, especially in the valleys tributary to the Licking river, is 
a matter of common knowledge. These flood plains have been 
lowered some in post-glacial times. That the bed of the Rocky 
Fork from Mary Ann Furnace southward about a mile and a half 
is rock is due to rejuvenation. But the rock walls along the stream 
north of Mary Ann Furnace probably represent the vigorous work 
of the immediate ice-front drainage. Similar conditions marked a 
recessional stage of the Wisconsin ice, and developed the cliffs in 
the valley of Lost Run. 
(2) As an agent of erosion, an ice-sheet in its distal portion is 
especially weak;' there is very little evidence that the ice changed 
the outlines of even the bolder hills in this township. I do not 
attribute to the ice any over-deepening of valleys, or through- 
valley work here. Therefore the general effect of glaciation in 
this region, so far as a study of stratigraphy is concerned, has been 
to give the uplands a thin mantle of drift, and to bury the flood 
plains and side walls of the valleys beneath heavy outwash depos- 
^ F. Carney: ^‘Valley Dependencies of the Scioto Illinoian Lobe in Licking 
County, Ohio,^^ Journal of Geology, voL xv, pp. 492-95, 1907, A picture of this 
ridge is shown in the Bulletin, voh xiii, p. 138, 1907. 
