article: Epoch (geology)
links: Quaternary Neogene Upper Triassic Palaeocene Cretaceous Lower Cretaceous Mesozoic Jurassic Middle Jurassic Oligocene Lower Jurassic Holocene Tertiary Middle Triassic Pliocene Upper Jurassic Eocene Pleistocene Upper Cretaceous Lower Triassic Quarternary Miocene Cainozoic Palaeogene Triassic