Yonaguni Monument
A submerged rock formation off Yonaguni Island, Japan, that some argue is a man-made structure dating to 10,000 BCE.
Documented record
Known Facts
The Yonaguni Monument is a submerged rock formation off Yonaguni Island, Japan.
It was discovered in 1986 by diver Kihachiro Aratake.
The formation has right angles, terraces, and what appear to be carved steps.
Marine geologist Masaaki Kimura argues it is a man-made structure.
Most mainstream geologists consider it a natural formation.
If man-made, it would date to approximately 10,000 BCE when the area was above sea level.
Supporting claims & documentation
Evidence For
Underwater Documentation
PHYSICALUnderwater photography and surveys of the formation.
SOURCE:Divers / Marine geologists
Kimura's Analysis
ANALYSISMarine geologist argues the formation shows evidence of human carving.
SOURCE:Masaaki Kimura / University of Ryukyus
Counterpoints & criticisms
Evidence Against
Natural Formation Consensus
ANALYSISMost geologists attribute the formation to natural sandstone fracturing.
SOURCE:Geological survey
Unresolved inquiries
Open Questions
Is the Yonaguni Monument natural or man-made?
If man-made, who built it and when?
What would this mean for ancient maritime capabilities?
Why was the area submerged?
Chronological record
Timeline
Area above sea level; monument potentially constructed.
Monument discovered by diver Kihachiro Aratake.
Masaaki Kimura begins detailed study.
Connected dossiers
Related Investigations
References & further reading
Sources
Automatically discovered links
Related Connections
Both involve activities during the 1990s period.
Both involve activities during the 1980s period.
Both involve activities during the 1990s period.