Is this an old ship ballast?

[M.West]

I live in Soldotna Alaska, several years ago a friend of mine knew I collected rocks and everything else off the beach. He gave me this, he said a friend of his found it off an Island up here, possibly somewhere off the Aluetian chain. I don't believe its an anchor, maybe its a ballast of some kind. It weighs about 40 or 50 pounds, the bottom is flat with rounded edges. No one seems to know, not even our archeologist.

 

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[ironhorse]

the first thing to come to mind would be a stone for grinding grain etc, but that might not be the case in Alaska unless it was brought there for that purpose , otherwise it might be a stone ground by a glacier and placed there forever ago when it receded