AUDIOPHOTO: ENGRAVER: R. C. COLLINS, AFTER WILLIAM JACOB BAER. PUBLIC DOMAIN. · PUBLIC DOMAIN
Historical EventsAncient CivilizationsCONTESTED
Serpent Mound Dating Wars: Adena vs Fort Ancient
Adena vs Fort Ancient 14C fights at Serpent Mound. Contested dating—no hollow-earth.
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