These are spherical nodules I received from an acquaintance, before cleaning. * Collected from the Tentokuji Formation, Nishisenboku area, Daisen City, Akita Prefecture * Age: Neogene Pliocene, 5.6 to 2.6 million years ago Calcareous concretions (nodules) I checked the probability of finding fossils in nodules, and it seems to be about 1/3 to 1/4... They said it's also about luck. So, I'm offering them as a set of 3. Mainly, bivalves and snails are found. The jackpot is a "crab" ＼(^-^)／ I've included photos of similar nodules from the same stratum after cleaning in the latter half of the listing, so please take a look. Please feel free to ask if you have any questions. I will ship via Mercari delivery within 1-2 days.