始新世 始新世 Еоцен eocene Paleocene Epoch eocén Eocenas eocén Eoceen Rupelian Age Base of Eocene older bound -56 Ma Eocène Thanetian Age Bartonian Age Ypresian Age a1.1.1.3.2 Base of Oligocene Eocénico eocen eocen Priabonian Age Paleogene Period Eotseen Lutetian Age Eocene Epoch Oligocene Epoch Eozän Eocene Eocén younger bound -33.9 Ma Phanerozoic Eon Cenozoic Era Geologic Time Scale (2018) Eocæn Eoceno Eoseeni Eocen Eocen