< Page:Popular Science Monthly Volume 55.djvu
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THE ANTIQUITY OF MAN IN NORTH AMERICA.
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pendicular, as would be the case if it had fallen down some root-hole, animal's or insect's burrow, or opening in the earth from any cause, and now obliterated.
Fig. 3.—Occurrence of an Argillite Implement in Glacial Stratified Sand.
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