Native clay bead maybe!?! Can anyone id?

[swizzle]

 

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[The Grim Reaper]

It looks more like what I call Worm Holes. Not sure what they actually are but they are natural. I have a spot on the Ohio River where I can pick these up all day. They are just hardened mud and not actually a Clay piece.

 

[Geradot]

It looks like - Belemnitida

 

[swizzle]

Would these be commonly found with horn corals and trilos?