Any Help would be awesome!!!

[AlabamaAdventure54]

I found this piece today along the Patuxent River on the southern peninsula. This spot has a lot of History. War of 1812 came ashore here and an old manor called Susquehanna was on site not far.
The piece is all stone. Agate. No holes and the sides are smooth. I’m stumped!! 😳❤️

 

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