Shell Surprise in NJ Cretaceous brook

[Fishinfossil]

Found this little clam type full mold in NJ Cretaceous stream (not Big Brook). First time I've found a shell mold like this there. Reminds me of the Coquina clams in the undertow along the Jersey beaches in the summer. Any info on what it's nomenclature may be? Fun highlight of the day outside of the common shark teeth.

Edited November 2, 2021 by Fishinfossil

[Thomas.Dodson]

It's not easy to identify molds, especially when they are this worn. Some characters remind me of Nemodon so you might try looking into that route. Is that worn area in the middle potentially a sulcus?

 

Some more well lit photos might help.

[Plax]

Nemodon popped into my mind also! Lots of steinkern IDs in Richards Cretaceous of New Jersey two volume set available as pdf from the NJ Geological survey.

[Fishinfossil]

Thanks for the insight. Whatever it is, its pretty cool to see it survive the millenia