302 The American (ieoloyist. November, i8f6 
in which ])('ri()tb of base-leveling- are made the all-important 
features in the cycle of land degradation and the conse(|uent 
sedimentation in adjoining seas. 
If an east and west cross-section of the North American 
continent, as from Richmond to San Francisco, be considered, 
a diagrammatic representation may be made in which the geo- 
graphic provinces are cut off by verti(*al lines and the geolog- 
ical systems by horizontal lines, the latter being separated ap- 
proximately in proportion to the estimated time intervals. 
This stands for the continuous and uninterrupted geological 
history of the continent, and the stratigraphical succession 
from the earliest to the latest formations. In the proper places 
may be indicated the physical breaks in what would'have oth- 
erwise been a continuous sequence. These lines of unconform- 
ity then extended laterally across as much territory as they 
approximately affected, and represent only the horizons, or 
the times at which they occur. 
HUMAN RELICS IN THE DRIFT OF OHIO.* 
Hy E. W. Cl.vyi'Ole, Akron, O. 
[Plate XI.] 
That man existed in the old world during the later Ice age 
is a doctrine in anthropology regarding which little or no 
doubt can now be reasonably entertained. That he was pres- 
ent there during an interglacial era, if any such occurred, is 
scarcely less certain. And no small amount of evidence is 
already obtained which supports the opinion that man even 
preceded the ice in northern and western P^urope, But on this 
side of the Atlantic the ice-sheet thus far has proved a bar- 
rier beyond which human footprints have not been found. 
Glacial man, and still more, interglacial man, is therefore here 
a shadowy, semi-mythical being of whose existence the an- 
thropologist feels at best very uncertain. 
It is true that not a few eases have been brought forward 
in which human relics have been found in such association 
with glacial deposits as to point strongly to the conclusion 
that both were of the same age. But in all these cases the 
deposits in question belong to the very latest stages of the 
^Presented to Section H, A. A. A. S., Buffalo, 189G. 
