What could this be?

[Jordan62]

Found many of these in different sizes but can't find what they are

 

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[RiverWalker]

Its hard to tell, but it kind of resembles a snail, or an ammonite. But could just be a rock, if there's a lot of them, try shaving them down on one side with a file or grinder. If you have a spiral; you have a fossil.