Artifact from Deposits of Mid-Wisconsin Age in Illinois.
Discovery of an artifact of human manufacture imbedded in Roxana loess, classed as Altonian substage of the Wisconsin stage of the Pleistocene, of an age of 35,000 to 40,000 years, contributes to the determination of the age of man in the New World.
Munson
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PJ
Frye
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JC