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Re:How to build something that lasts 10k years by wnkrshm on Wednesday June 12, 2019 @07:05AM (#20163372)
You can count rings of a tree you cut down - if you have a system for relating/storing their planting time deltas then you can measure by cutting down a tree and planting new ones.

Edit: Apparently, together with climate data you can determine the year the tree was cut down hundreds of years after the fact [0].

[0] https://en.wikipedia.org/wiki/Dendrochronology

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