Broken Pottery shard OR fossil🤔🧐 ??? ( pics)

[cowsaretrippy]

Found this on a hike in Maine. I don't have any background in geology but it's struck me as odd The one side has raised ridges which sort of looks like a rim of a vessel yet on the other side th

ere is a darker mark shaped perfectly like a partial square.. any knowledge is appreciated.

 

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[Blackfoot58]

Found this on a hike in Maine. I don't have any background in geology but it's struck me as odd The one side has raised ridges which sort of looks like a rim of a vessel yet on the other side thView attachment 2093464View attachment 2093465View attachment 2093466View attachment 2093467ere is a darker mark shaped perfectly like a partial square.. any knowledge is appreciated.

Definitely catches the eye as a pottery shard