Indian?

[OxShoeDrew]

Saw this no where near 18th or 19th habitation. About 16in perfect circle, high ground, maybe 200 yrs from river. Second shallower one on same rock. Any ideas?
https://lh3.googleusercontent.com/_QLipCPrJUDCNkSn9JyBFj3w0K8bkNFQ8StGf4T06WZdj0bWfu JqtsiZinsB81muNMyysWtQUlK6F6RfSziYudtpZh5AjIoaApOB aoZhbTTHio8WYDn4NHdfWr70DDbK3kOSRjZhNuD9_d7zlSc3wK hW_y-cDmXMUPX_nmIkAxHG09IYJJX1t0lj-5-kNGpBGx_YmfDQI0zIB1NezKCKpZFa7FZ9IU_yHhcLbszQ3agVB POWuCF039Lyay3gg6oiQ1et3DiqA2TUhwR99dwyM-zT5s-YHVCdyJsUrLpqeCLE-vfkLRyfv7jRMMtFO2yLiHz_1G1L0DTa1sdZ9BbsFk_hbBszQof Foy3vpYvEFC1E9I8kXcj6kYNn_I0ecIz3_z_2Hk9aEiInq9P5i 8LjMvH-3PbmRb6hNxykhB7hbZbmYzL-sFGhQR7rD4a_hhM7lYlginOD6pVN5UFIbUDeQJ-IuG7Ptjvl6fAaVKUye2f84mqZnGQu5lzNDyB8hFe9UynklQ6N9 d-gezxQju2R4iaEWzF4-vYdNXVg2es6NMffxr-d-SHKJB8ySS9d0SBxZO-PTbO9WrJzQUszXM7T6TnO17Nb2x5KY58pZ8bbHi2E0dpNYMc16 V5tsx0a16r8kRbq4ejQnKC6Wk4yFcmBb79WyUAh3eC977tS9vy SQN5snniP-LVCE4AcX00T_FqaIHXTs0QxvOBbHQ7Z2GaRvUjXP4_87CsZ11L C4ouvwU39D3HifTKFiEFWTOfQ=w1846-h1384-no?authuser=0

[Menzl]

Such stones are also available here. Often they were inclusions of sandstone that have weathered. But there are also artificially made near prehistoric settlements. According to some sources, they were used as grain mills.

http://www.goetterhand.de/001%20Steinloecher.htm70209

[OxShoeDrew]

Thanks, Menzi. I read that they could be naturally made but they'd have to be in rivers like the picture you shared. The one I saw was nowhere near the river.

[Menzl]

I'm not sure but I think the picture doesn't show a riverbed but holes filled by rain. Look at the link above. There are also some in the forest. From my experience I know similar holes from the Alps.

[The Rebel]

Here's your answer:

How do large holes form in river rocks? - by Heather Wall (substack.com) (https://naturalwonders.substack.com/p/how-do-large-holes-form-in-river?s=r)

[badgers325]

Hi Drew - Rivers will move over 100s of yards over time. It is quite remarkable what mother nature can do.