Probably natural but...

[gentleone444]

Figured Id check. The one side has a concave depression in it the other side is just slightly convex.

 

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[reuellis]

I would bring that home, natural or not.

 

[NCPeaches]

I agree with reuellis, I would bring it home too. With the dip in one side it mighta been a mortar of some sort.

 

[Indian Steve]

I Would have brought it home too.

 

[dognose]

It is interesting.

What state are you in?

It appears to be limestone, what is the material?

In what context was this found? Give some details how this was found please.

 

[The Grim Reaper]

It is interesting.

What state are you in?

It appears to be limestone, what is the material?

In what context was this found? Give some details how this was found please.

It does appear to be a piece of eroded Limestone so the divot is probably formed by a fossil eroding out.

 

[gentleone444]

It is interesting.

What state are you in?

It appears to be limestone, what is the material?

In what context was this found? Give some details how this was found please.

Im in northwest pa...i found it on a Lake Erie beach.