Help identifying? Found in Missouri

[RogueFlea]

I'm very new to fossil hunting and found this on my first trip. Maybe a nautiloid cephalopod?
Thanks in advance!

 

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[Charlie P. (NY)]

Appears to be a crinoid stem that didn't fossilize and the cavity is where it was. Called a "trace fossil" when that happens.

 

[RogueFlea]

Appears to be a crinoid stem that didn't fossilize and the cavity is where it was. Called a "trace fossil" when that happens.

Thank you!