Floium Floium Middle Ordovician Epoch Floiense floij older bound -477.7 +|-1.4 Ma floi Flo Flo Flo younger bound -470.0 +|-1.4 Ma flo flo 弗洛期 a1.1.3.5.3.1 Floien フロイアン期 Early Ordovician Epoch Tremadocian Age Ordovician Period Phanerozoic Eon Floiano Geologic Time Scale (2020) Paleozoic Era floiano Floiën Flois Floian Age Floi Base of Middle Ordovician Floian Floian Base of Floian Dapingian Age