Possible nutting stone or grindstone?

[RelicDude]

I was exploring the local river in Western mass looking for antique bottles. When I came across this stone with a perfect divot in it. Could it be a grinding stone or some kind of crucible? Sorry I only have one pic. If a possibility I will go back and retrieve it. Thanks in advance for the help.- Justin

 

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[arrow86]

It does look like one pics of it cleaned up a bit would help determine for sure

 

[ptsofnc]

Sure looks like it might be an nutting stone. Often there are several divots. Check the other side. Looks pretty big.

 

[IMAUDIGGER]

Found along a river? I'd say the chances are higher that it's a broken piece of bedrock with a boil hole that started to form.

 

[Tdog]

Looks like it could be a bedrock mortar.

 

[Out Of Time]

I reckon it's a mortar.

 

[Huzzah!]

Retrieve and clean! If it isn't natural, then you have another cool piece to display. If it is natural, then you have gained more knowledge to decipher next time.

 

[A2coins]

Grab that bad boy nothing to lose