[Grimmy]

I’m curious as to how the know when it was built.

[SunkenCiv]

There *may* be a topic that talks about that in the keyword, but meanwhile, it has to do with radiocarbon dating of some organic material (possibly an old campfire) which tested out from the Fort Ancient period. That is likely to mean that the existing old structure was used by the later group, rather than they built it.

There's a possibility that the figure was not originally in the form we see now, since it has different strata laid down at different times. The original length and shape may have been quite different. But my seat of the pants guess is, the serpent is really a comet (hence the big circle at the head) and then it becomes a matter of what the lowest strata yields to scientific dating.

IOW, time to ping another list.

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