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    @Noldorin the upper bound of 65000 years is one that was abandoned (in the most canonical works) as far as I'm aware. The 5000 year mark would make much more sense in the span of time and the length of lives etc.
    – Edlothiad
    Commented Nov 7, 2017 at 7:02
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    @Noldorin - Tolkien's first age has pretty much always (since the 1937 canon) been about 600 years. It's the stuff before the first age that counted in the tens and hundreds of thousands of years. I break down the different canon versions in this answer.
    – ibid
    Commented Nov 7, 2017 at 7:26
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    Is this true though? I'm not sure, but I heard once that the slag the Carthageans left behind in Spain is still worth looking at today, and that's been around for more than 1200 years. (And is presumably less than the Dwarves brought out of Moria)
    – sgf
    Commented Nov 7, 2017 at 13:57
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    @sgf if you look at photos of the purported slag, it's quite hard to tell from a natural landscape. That's my point: by "weathered" I meant to imply not just erosion but scattering, accruing topsoil (and vegetation) and other natural processes that stop you seeing slag as slag, but part of the land. TBF the previous accepted answer mentions this too - I had no intention of supplanting it as the OP seems to have done. I just wanted to put some dates on the process.
    – Bob Tway
    Commented Nov 7, 2017 at 14:04
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    "If you look at most monuments of that age that still stand in the world today, there's not a great deal left of them, even though they were built to stand and there have been strenuous efforts to preserve them. How quickly, by contrast is a slag heap going to be reduced to local pebbles and boulders?" Most of those are above ground, though, and thus subject to different weathering forces.
    – jpmc26
    Commented Nov 8, 2017 at 3:57