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 Miocene and Pliocene to Neogene period, and added Neogene period to Geologic time scale (GTS)

Eric Walker added Sahelanthropus and a number of links to Miocene, and added Miocene to Neogene period

Eric Walker added a number of links to Pliocene, and added Pliocene to Neogene period