Is this a Native American grinding stone?

[hbru123]

I was metal detecting and I stumbled upon a big flat rock and on top of it there was a indent that looks manmade. I know the Kumeyaay Native Americans lived near this. Is this a grinding stone? That crushed up powder is definitely new. It was also the only one like it on the rock.

 

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[Old Pueblo]

Looks natural to me.

 

[Peyton Manning]

the crushed up powder is new?
you mean you think some indians just used it?

 

[hbru123]

Looks natural to me.

Thanks!

 

[hbru123]

the crushed up powder is new?
you mean you think some indians just used it?

Ya, my brother crushed some in there.

 

[Old Pueblo]

Thats a natural hole, but if you do find a real bedrock mortal, do not crush anything up in them. It will damage them.