toarci toarciano Aalenian Age Toarc Toarc Toaris toarcij Тоар Base of Toarcian toarc Toarciën Middle Jurassic Epoch トアルシアン期 Toarciense Lower Jurassic Epoch Toarcien Toarcien younger bound -174.1 +|-1.0 Ma Mesozoic Era International Chronostratigraphic Chart (2017) Toarciano Jurassic Period Toark Toark Toarci Toarcian Age Phanerozoic Eon Base of Middle Jurassic Toarcium toark a1.1.2.2.3.1 Pliensbachian Age Toarcian older bound -182.7 +|-0.7 Ma 托阿尔期