Eric Walker added Geologic time scale - Wikipedia to Geologic time scale (GTS)
Eric Walker added The Second International Geological Congress, Bologna, 1881 to Geologic time scale (GTS)
Eric Walker added ICS - Chart/Time Scale to Geologic time scale (GTS)
Eric Walker added Cretaceous–Paleogene boundary and Upper Cretaceous and a number of links to Cretaceous, and added Cretaceous to Geologic time scale (GTS) and Mesozoic
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 Neoproterozoic era and Proterozoic - Wikipedia to Proterozoic eon, and added Proterozoic eon to Geologic time scale (GTS)
Eric Walker added a number of links to Holocene, and added Holocene to Geologic time scale (GTS)
Eric Walker added Miocene and Pliocene to Neogene period, and added Neogene period to Geologic time scale (GTS)
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 a number of topics and a number of links to History, prehistory and geologic time, and added History, prehistory and geologic time to Time
Eric Walker added a number of links to Little Ice Age, and added Little Ice Age to Middle Ages and Geologic time scale (GTS)
Eric Walker added a number of topics and a number of links to Geology, and added Geology to Science, engineering, mathematics and the humanities
Eric Walker added 2017-07 New York magazine article on climate change by David Wallace-Wells and a number of links to Anthropocene epoch, and added Anthropocene epoch to Geologic time scale (GTS)