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Aptychus or Pelecypod Associated With This Ammonite?


AK hiker

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Recent ammonite find and noticed the associated shelly fossil. Suspect most likely a pelecypod but has different crystal and growth pattern so wondering if it is possibly an aptychi? How can you tell the difference? Any input is much appreciated. 

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Looks very much like a clam/bivalve/pelecypod to me.  The general shape and growth lines looks bivalve, but even more relevant is the calcitic structure which is very different from aptychi.

 

Don

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Got it, bivalve/clam it is. I Was out yesterday and another “clamanite” spotted :)IMG_3250.thumb.jpeg.b77d14e29eb3265280565ffd483b1687.jpeg

 

Thanks for the clarification. 

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6 hours ago, FossilDAWG said:

 “Nice Incoceramus/Pachydiscus (I think) association. “

 

I believe that is correct I.D. for both and noticed there is fossilized wood there as well. Quite the combo fossil.

 

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