grooves on the rocks

[daghan190]

I expect this comment to a friend signs

 

[AKiwi]

Looks like someone cut out a mill stone...... but then how would the bottom be cut off?
Could be the leg of a spaceship millions of years ago in mud??
Mmmmmmm....

 

[Old Dog]

Arrastre ?

 

[daghan190]

I'm sorry. My english very poor. I could not understand what you mean. I'm trying to deal with google translate.

 

[trailseeker4]

I agree with old dog this is probably an arrastre...
ts4

 

[Blind.In.Texas]

The last picture has a groove leading from the bowl. I don't think it is an arrastre. I don't about the others.

 

[mannings]

Does kinda resemble the 'key' symbol, huh?

 

[Old Dog]

I'm sorry. My english very poor. I could not understand what you mean. I'm trying to deal with google translate.

Arrastre is Castillian Spanish .
Refers to a specificly designed structure used to grind roasted ore.
The circle with the pivot hole in the center kind of gives it away.

 

[daghan190]

comments, and thank you for your efforts.
Another comment I would expect that their friends also interpreted.