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Or maybe it’s some sort of barnacle

Hi Stacy, this looks like it could be part of a crinoid but a clearer picture and location of where you found it would be helpful!

I found it in the rock garden Or a spot where they used to mention larger and river rock for the landscaping so I don’t even know where they came from I was in Columbia Missouri when I found it so I don’t know where they got the rock that they put down thank you though