Creek walk today

[Blackfoot58]

Creek walking today. Got these 2 fossils.
Left side: faint squares on border.
Right side: this one is interesting.
One side is dimpled, the other side is the opposite of dimples. The tree is 3” tall, for size comparison.

 

[CreekSide]

Looks almost like barnacles on the right one. But I’m not a fossil guy. We really don’t have fossils that I’ve seen other than grass.