👉 Silurian is a geological classification system used to categorize rocks and fossils of the Silurian period, which occurred approximately 4.5 billion years ago. This period was one of the youngest in Earth's history, spanning from about 3.8 to 2.6 billion years ago. The term "silurian" refers to the fossil record during this time when many of the major geological events and processes were occurring. The Silurian rocks are characterized by their high levels
