An Era spanning 542.0 (±1.0) to 251.0 (±0.4) million years ago, comprising – from oldest to youngest – the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian Periods.
An Era spanning 542.0 (±1.0) to 251.0 (±0.4) million years ago, comprising – from oldest to youngest – the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian Periods.