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Any geologists out there?

I found this interesting rock in a creek bed. I'm wondering what this formation is called and how it's created.
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SageWanderer · 70-79, M
Maybe in Google images? I tend to agree with @ScreamingFox that it looks like a fossil in a sedimentary rock.
@SageWanderer I tried that first, couldn't come up with anything definitive.
SageWanderer · 70-79, M
@robingoodfellow Wish I knew a geologist who could help. Everyone I know is either medical or metallurgical.