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Yonaguni Monument

Submerged step-like sandstone off Japan; natural vs partly man-made debate.

Dated events and their evidence

• 8,000 BCE disputed
  claimed man-made stepped monoliths (Kimura); submerged as sea level rose after the Ice Age source
• 8,000 BCE mainstream
  mainstream geology: natural weathering of Miocene sandstone along bedding planes and joints (Schoch, Wichmann, Nunn, Ogata et al.); not recognised as a cultural artefact by Japan source

Where

24.4353° N, 123.0111° E

Sources

• https://en.wikipedia.org/wiki/Yonaguni_Monument

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