One of the mysteries of the English language finally explained.
Of, relating to, or designating an interglacial stage of the early Pleistocene in North America, between the Nebraskan and Kansan glaciations.
With the. The Aftonian interglacial or its deposits.
Late 19th century. From Afton, the name of a town in Iowa, U.S.A., where an exposure of these deposits was found + -ian.
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