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A comment on Century-Old Stone "Tsunami Stones" Dot Japan's Coastline. Parent comment

Re:Century-Old Stone "Tsunami Stones" Dot Japan's Coastline by kurthr on Monday April 01, 2024 @02:33PM (#39897486)
If you find coral deposited more than 100ft above sea level, it's another marker of danger... although perhaps on a longer time scale.

Hawaii has several examples of this (coral found at sites over 500ft) from what are assumed to be Mega-tsunami.

https://www.e-education.psu.edu/earth107/node/1610#:~:text=O....

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Re:Century-Old Stone "Tsunami Stones" Dot Japan's Coastline by thih9 on Monday April 01, 2024 @05:26PM (#39899567)
> another marker of danger

Note that tsunami stones, except one, are not markers of danger, at least not in a precise, spatial sense. They’re like memorial plaques, listing past casualties or marking gravesites. See grandparent comment.

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