Old collection: Valuable Chinese antique 【Trilobite Fossil Inkstone】 (Fossil approximately 251 million years old) Highest quality raw stone writing instrument Rare treasure The raised areas are very smooth Brand new, unused Comes with an inkstone cosmetic box Trilobite fossils lived from the early Paleozoic Era (Cambrian period) to the late Paleozoic Era (Permian period), approximately 251 million years ago. They are representative invertebrates of the Paleozoic Era, when life on Earth exploded, and are famous index fossils, rivaling ammonites that lived throughout the Mesozoic Era. Trilobites were benthic arthropods that lived widely in the world's oceans for approximately 300 million years, from the Cambrian period (about 542 million years ago) to the end of the Permian period (about 251 million years ago) in the Paleozoic Era. Rare and valuable item