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Great Serpent Mound

World's largest effigy mound in Ohio; construction date genuinely disputed (Adena vs Fort Ancient).

Dated events and their evidence

• 300 BCE disputed
  2014 study: Adena attribution source
• 1070 CE disputed
  charcoal dates: Fort Ancient attribution source

Where

39.0264° N, 83.4308° W

Sources

• https://doi.org/10.1017/S095977431800001X
• https://en.wikipedia.org/wiki/Serpent_Mound

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