Found as Landscaping Decorations

[Buried Crap NJ]

So I'm throwing this out as is this man made or natral? I saw this the other day driving through a large parking lot entrance exit. I went back and took a few pictures. I'm now see a drilled hole? I'm thinking this is a paleo sanding table? If the grooves didn't intersect at near 90 degrees I wouldn't have thought much about it? Maybe I'm just nuts?

 

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[elh]

Speak to the folks that own the parking lot. They knew something or it would have been gone. I saw my Mother use a rock to sharpen a kitchen knife. And I'm not telling my age.