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Originally the specimen was collected as a concretion from upper Pierre Shale Formation near the lowest level of the Fox Hills Formation. The collection location is Cedar Creek about seven miles south of Glendive, Montana. The Date collected was Oct. 12, 2018. Later, I removed most of the concretion/matrix with diamond blade and bits. Two of the hoploscaphites spedeni were badly crushed and fractured during fossilization and are missing half of shells. During prep, I miscalculated the depth of cutting blade, slightly damaging the middle scaphites.
Just found this in glendive Montana. It's thin like turtle shell but has several raised sharp adornments, resembling pineapple skin. Two of the sides are completed edges, while two are fresh breaks. It doesn't match up with any of the common turtle species I could find. Any ideas?