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Exact same thing at Morrow Mountain in North Carolina. It was a quarry used by natives for thousands of years to obtain Rhyolite for tools and weapons. Apparently Rhyolite was a big deal everywhere. Who knew? It feels as if I'm missing out on some sort of universal human experience of making sharp stuff out of Rhyolite.

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People overlooking Native American sites because they were on too large of a scale and assuming they're natural formations is kind of a cliche at this point - the mounds left behind by the uncreatively named mound builders are another example.

It amazes me how few know about the mounds. I look through a lot of the books from 1840's that detail them all in Oh/Mi/IL/etc.

Link with cool descriptions and maps etc of those in Ohio. I located some on modern maps that you can still see and that havent been disturbed in a long long time.

https://archive.org/details/descriptionsofan00whit

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