fossil or rock ? #2

[Muddywaters]

Hello .
Here's another example of fossil or rock. Personally I'm leaning towards fossil but honestly I don't know.
I purchased them from a guy that has access to an older man's collection that must of heard I occasionally but rocks. Anyways. I believe they're from Minnesota, but I wouldn't bet much that they were if I had to..

 

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[blauer]

What did the seller say it was?

 

[NJearthman]

Part of a Gastropod shell I think

 

[Muddywaters]

seller didnt know just said it was a rock his friend had laying around.

 

[Muddywaters]

what's a gastropod?

 

[NJearthman]

Gastropod info https://isgs.illinois.edu/outreach/geology-resources/gastropods

 

[Hufflepuff Buff]

Turrittela shell in limestone matrix
https://www.google.com/search?q=fos...ih=742&biw=412&prmd=isvn#imgrc=QTx63pBgypRgFM