Eric Walker added a number of links to Eocene, and added Eocene to Paleogene

Eric Walker added Cretaceous–Paleogene boundary and Eocene to Paleogene, and added Paleogene to Cenozoic

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

Eric Walker added a number of links to Cretaceous–Paleogene boundary, and added Cretaceous–Paleogene boundary to Cretaceous and Paleogene