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Myophloria, mabey?

I see a flattened Crinoid stem with branches.

So I did a bit of searching and found that in the Carboniferous period, there was a parasitic coral named Cladochonous that would attach itself to crinoid stems and try to grow off of it. Some crinoids would try to expand and grow over the coral, and you can find both fossils of large crinoid stems with a coral inside and large corals with a crinoid stem inside. I think this is a crinoid stem that had young corals on it, trying to take it over.

The wonders of nature never cease to amaze