eifeli eifel eifel Base of Middle Devonian Early Devonian Epoch Base of Givetian younger bound -387.7 +|-0.8 Ma eifeliano a1.1.3.3.2.2 Eifeli Eifeliano Eifel Eifel Eifel アイフェリアン期 older bound -393.3 +|-1.2 Ma Geologic Time Scale (2018) 艾菲尔期 eifelij Eifelis Middle Devonian Epoch Emsian Age Eifelium Eifelium Paleozoic Era Eifelian Age Eifeliense Eifelian Eifélien пйфел Eifeliën Phanerozoic Eon Devonian Period Givetian Age Eifelien