These are spherical nodules I received from an acquaintance, prior to cleaning. * Collected from the Tentokuji Formation, Nishisenboku area, Daisen City, Akita Prefecture * Age: Neogene Pliocene Epoch, 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... My acquaintance said it's also a matter of luck. Therefore, I'm offering them as a set of 3. Bivalves and snails are often 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.