Stone terraces, right angled blocks and walls, and stone circles encompassing hexagonal columns look intriguingly, if not conclusively, man made. A few more clues: an encircling road, that look like post holes that supported long-gone wooden structures, cut steps, and castles with similar architecture located on land.
Prof. Masaaki Kimura, a marine geologist with the University of the Ryukyus in Okinawa has spent several years studying Yonaguni, which was discovered in 1985. Kimura believes these are monuments made by man, left by an unknown civilization, perhaps from the Asian mainland, home of our oldest civilizations.
He reasons that if the five layers on the Yonaguni site had been carved by nature, you would find debris from the erosion to have collected around the site, but no rock fragments have yet been found.
He adds that there is what looks like a road encircling the site as further indication it was used by man. He believes building this monument necessitated a high degree of technology, and some sort of machinery.
How to date these sites? A few possible scenarios have been suggested. The sites may have been submerged when sea levels rose at the end of the last Ice Age as the continental ice sheets melted. Or, as Japan sits on the Ring of Fire, tectonic activity might have caused subsidence of the land. Or perhaps a combination of subsidence and inundation from rising sea levels, or some catastrophic event, dropped it, intact and upright, into the ocean.
Teruaki Ishii, a professor of geology at Tokyo University, believes the site is partly man-made, partly natural, and suggests a date of 8,000 B.C., contemporary to the ancient civilizations of Mesopotamia and the Indus Valley. Others have suggested a date of 12,00 years.
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