Eric Walker added Phanerozoic - Wikipedia to Phanerozoic

Eric Walker added Cenozoic - Wikipedia to Phanerozoic

Eric Walker added Cretaceous and Triassic and Mesozoic - Wikipedia to Mesozoic, and added Mesozoic to Phanerozoic

Eric Walker added a number of topics and a number of links to Geologic time scale (GTS), and added Geologic time scale (GTS) to Geology and History, prehistory and geologic time

Eric Walker added a number of topics and Paleozoic - Wikipedia to Paleozoic era, and added Paleozoic era to Phanerozoic

Eric Walker added Paleozoic era, Cenozoic and Mesozoic and Phanerozoic - Wikipedia and Cenozoic - Wikipedia to Phanerozoic, and added Phanerozoic to Geologic time scale (GTS)

Eric Walker added Paleogene, Paleocene and Quaternary and a number of links to Cenozoic, and added Cenozoic to Phanerozoic