Trilobular Fossil

Trilobular Fossil

Trilobular fossil, swallow stone, also known as bat stone, is scientifically called trilobular fossil. Trilobites (TRILONITES), a Paleozoic arthropod, belongs to the Trilobites, and are born on the seabed. They have a wide variety of species and vary in size, ranging from one centimeter to one meter. They were born in the Cambrian period (570 million years) and were the most prosperous to the Ordovician period (450 million years) and were extinct at the end of the Permian period (252 million years ago, 252 Ma). [1]