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Hi all! Please tell me this is more than a concretion! Edit to add location: Found in Lansing, NY. The matrix is a dark grey/black shale that breaks under it's own weight when I lift pieces and it breaks off into big chunks unlike thinner layered shale also in the area. I think I see crinoid stems and wonder if there are other fossils (Hallotheca acils ?) under a shallow layer of sediment making the cone shape appear to have rounded sides or is this something completely different (I think I've been finding nice molds of Hallotheca acils in close proximity to where I found this guy today). I hope to return tomorrow and find the other half to try and glean more information from the molded half. It was the only fossil in this piece of stone but I found two species of Rugosa and multiple species of Brachiopods in similar stones lying within a foot of it. It's delicate and I've wrapped it in wet paper towels and placed in a shallow dish with water. The entire item measures 2cm wide x 8 cm long. Thank you for your time