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32
THE POPULAR SCIENCE MONTHLY.
The geologic evidence of the environment of the celt-users of the Delaware River is complete and intelligible: the continuity of the deposits proves that the Trenton gravels were laid down while the northern part of the country was occupied by ice, and while
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b1/PSM_V34_D042_1887_stereogram_of_the_head_of_delaware_bay.jpg/500px-PSM_V34_D042_1887_stereogram_of_the_head_of_delaware_bay.jpg)
Fig. 5—Stereogram of the Present Head of Delaware Bay.
the terminal moraine was forming; their structure and composition prove that they were laid down in shallow floe-bearing waters; their distribution indicates unmistakably the geography