Sip back and discover the Arenig Age dating back 477.7 – 470 Myrs, a dynamic Early Ordovician interval marked by rising seas, tectonic activity, and the Great Ordovician Biodiversification Event. Defined by Adam Sedgwick in Wales and globally recognised at Hunneberg, Sweden with the “golden spike” GSSP, the Arenig reveals ancient oceans, trilobites, graptolites, brachiopods, cephalopods, and early reefs. Explore its fossils, geology, and heritage across Wales, England, Scotla