For #FossilFriday, Tentaculites! ... whatever they were. Who doesn't love Paleozoic problematica? Especially the ones that might have been lophophorates? 🧪⚒️
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Rock covered with small (cm scale) tapered black conical fossils with regularly spaced ribbing parallel to the aperture. Label: "Tentaculites gyracanthus (Eaton) Manlius limestone Upper Silurian Albany, NY"