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They look like various Gastropod shells, and the big one might be a an echinoid

I thank you for your impute however i cant say that I agree.. Just an idea but what if its where stems of shore side plants sprouted from the mud, then hardened.. Like I said just an idea. I hear they are called Button Fossils here in Vermont but have been having trouble tracking down information on them.

I couldn’t find anything on them, so I can’t agree or disagree with you. I guess you’d have to ask locals for answers.