Originally posted by sneakygroundbuzzard
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Thanks for your confidence!
These kinds of features are not uncommon. Since they're often present on large prominent rocks (and also sometimes in multiples on larger slabs) and also a fortuitous shape they may well have seen use for grinding purposes. That is, the hole may exhibit some use-wear, despite having originally been made by mother nature. Prominent rocks like this also served as useful navigational points since they are frequently isolated and unmistakable in an otherwise unremarkable landscape... and that was true through to historic times, by both Native Americans and early settlers. There are lots of examples in various parts of America that acquired names like "Indian Rock", whether they had any association to Native Americans or not.
In fact, there used to be a large boulder in central Georgia that I would guess was also a glacial erratic which served as a "post office". It was the only large boulder in the vicinity and had a cleft in one side where stage coaches used to leave the mail. The township there came to be named "The Rock" since that's how the mail used to be addressed. The township still exists, but the rock itself was dynamited to make way for a highway some years ago.
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