Flat, black stone-like

[Wynja]

My chickens found this in their pen.
The two holes do not go all the way through. The blue green inlay is mildly magnetic, so some iron content. It is lighter than it looks, like it might be ceramic. I live in the Pacific Northwest, surrounded by forest, but close to Puget Sound. Nearby industries are fishing, farming, logging. Any clue what it might be? My chickens really want to know.

 

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[ANTIQUARIAN]

Welcome to Tnet from Toronto Wynja!
This piece is interesting, I have no doubt that someone here will recognize it.

Possibly Native American? Maybe consider re-posting it here... Geological Forums
Dave

 

[ticndig]

it reminds me of a padlock