Fossils from The Littleton, CO. Creek

[KaliCo]

Any idea what they are from?

 

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[LandSeig]

The middle one looks like a piece of a soft-shell turtle shell from the texture, my wife found one identical to it this weekend at the beach. The one on the left may be more of the same.

 

[KaliCo]

Thank you, LandSeig! I appreciate this. Maybe the one on the right is a mushroom they were eating? haha They were all found in the same creek.
Seriously, I appreciate your looking and helping me figure out what they are! Thank you!

The middle one looks like a piece of a soft-shell turtle shell from the texture, my wife found one identical to it this weekend at the beach. The one on the left may be more of the same.