help id please

[Red Earth]

This is a mortar I'm assuming. It is located in Texas on a friends land. Its quite large. The bowl itself is about 12in diameter. Anyone seen one likes this

 

[tomclark]

It looks like one! You could cook in a hole that size by dropping heated rocks into it. Color is weird!! lichens....what's all the white, caliche Who knows what's around, under that stone!

 

[NC field hunter]

I have seen stones like that. I know where two of those are, assuming loggers haven't torn them up. They are on a creek deep in the woods. So deep in the woods I never have pondered the removal of them. Tom, do you think the odd coloration in the pictures here could be the result of heating?

 

[painterx7]

That's a great find for sure !!!!

 

[creekhunter]

Could be natural but it does look like other examples I've seen, and yeah what is the white stuff?