Paleozoic Era Tremadociano Early Ordovician Epoch Tremadocien Тремадок Furongian Epoch a1.1.3.5.3.2 Tremadok Tremadok Base of Ordovician Tremadocium Geologic Time Scale (2020) tremadocij トレマドキアン期 tremadok Phanerozoic Eon younger bound -477.7 +|-1.4 Ma Floian Age Tremadociense Ordovician Period Tremadoc Tremadoc Cambrian Period tremadoc tremadociano Tremadokis Tremadocian Age Tremadocian Trémadocien Tremadoci Tremadociën Cambrian Stage 10 Age 特马豆克期 tremadoci older bound -485.4 +|-1.9 Ma Base of Floian