daping daping Dapingian Middle Ordovician Epoch a1.1.3.5.2.2 Daping Daping Daping Dapingi Darriwilian Age Dapingiën Base of Darriwillian Paleozoic Era younger bound -467.3 +|-1.1 Ma Dapingium Dapingium Early Ordovician Epoch Base of Middle Ordovician Дапинг Dapingian Age dapingiano Dapingiano 大坪期 ダピンギアン期 dapingij Geologic Time Scale (2020) older bound -470.0 +|-1.4 Ma Ordovician Period Phanerozoic Eon Dapingis Dapingiense dapingi Dapingien Dapingien Floian Age