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I had posted this piece in General Fossil Discussion area since it had my first trilobite on it. Someone message me saying that they thought it may be an echinoderm. The person said “that looks like an echinoderm ("calcichordate")fragment. Possibly the M1-M4 of a stylophoran(marginale elements)” I thought it was a form of bryozoan. However, I do not know the Mississippian or any Carboniferous fossils very well. So I’m willing to admit complete ignorance. Can anyone ID it and educate me as what it is? I found it in Siloam Springs, Arkansas in an area which Mancos identified as the Pitkin Limestone, which is Mississippian. ROCKD ID’d the area as St. Joe’s limestone. This is the item in question. I can’t say that I have seen segmented Bryozoa. The segments aren’t uniform in size. Although, I’m not sure if the segments are endemic or an artifact of being broken. I believe they are breaks. It is about 1.25 inches long and 7 mm wide. Just a slightly zoomed in pic of the same thing. A pic of the end. This is is a pic of the back side of the other side of the plate and other end of it, where there is a cross section honeycomb looking view. Your thoughts and comments would would be greatly appreciated. Kim