Much like island nations today, large stone walls may have been constructed to protect the site from waves that were slowly encroaching higher and higher.
mangrove sediments up to five metres deep. The only explanation for such deep mangrove sediments is sustained sea-level rise.
From this, we calculated that over the past 5,700 years, the sea level rose by about four metres. The most likely cause for this rise is that the islands are sinking: the land is going down relative to the sea surface.
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