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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I think you should take the time to ask the owner of the shoe if he’s okay.

robingoodfellow · M

@Mamapolo2016 I'm not sure what you're saying. I put my foot there for scale.

@robingoodfellow It doesn’t look attached to anything. Like a leg.

Never mind me.