new drill hole?

[hadji009]

found this one in creek bed doesnt look like it was drilled but is still perfect round 1 inch deep in deepest spot and 5 inches across, any help. thanks brent

 

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[Springfield]

Looks a lot like a hole meant to accept a large survey monument.

 

[cedarratt]

They steal the State survey markers here cause they are Copper, and they are about that size. That might be what happened.