Eric Walker added Silurian - Wikipedia to Silurian period

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

Eric Walker added Ordovician-Silurian extinction events and Silurian - Wikipedia to Silurian period, and added Silurian period to Paleozoic era

Eric Walker added Late Ordovician mass extinction (LOME) and Ordovician–Silurian extinction events - Wikipedia to Ordovician-Silurian extinction events, and added Ordovician-Silurian extinction events to Ordovician period, Silurian period and Extinction events