Eric Walker added Permian Period to Permian

Eric Walker added a number of links to Permian-Triassic mass extinction, and added Permian-Triassic mass extinction to Permian, Triassic and Extinction events

Eric Walker added Permian-Triassic mass extinction and Permian Period to Permian, and added Permian to Paleozoic era

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