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The following five timelines show the geologic time scale to scale. The first shows the entire time from the formation of the Earth to the present, but this gives little space for the most recent eon. The second timeline shows an expanded view of the most recent eon.
"The ICS International Chronostratigraphic Chart" (PDF). 2017/02. pp. 199–204. U.S. Geological Survey Geologic Names Committee. "Divisions of Geologic Time—Major Chronostratigraphic and Geochronologic Units" (PDF). USGS. Fact Sheet 2007-3015
|labels= optional - Sets geological time labels to be displayed (era, period, epoch, age) Period options: cenozoic not functional - displays entire Cenozoic timescale; quaternary not functional - displays Quaternary timescale; neogene not functional - displays Neogene timescale; paleogene not functional - displays Paleogene timescale
If the template has a separate documentation page (usually called "Template:template name/doc"), add [[Category:Geological range graphical timeline templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Geological range graphical timeline templates]]</noinclude>
The Geologic Calendar is a scale in which the geological timespan of the Earth is mapped onto a calendrical year; that is to say, the day one of the Earth took place on a geologic January 1 at precisely midnight, and today's date and time is December 31 at midnight. [1]
The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks).
c. 2.0–1.5 Ma – The basin of the Congo River acquires its present shape. c. 1.9 Ma – Oldest known Homo erectus fossils. This species might be evolved some time before, up to c. 2 Ma ago. c. 1.7 Ma – Australopithecines go extinct. c. 1.8–0.8 Ma – colonisation of Eurasia by Homo erectus.
The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, [34] [35] [36] soon after the formation of the Earth's crust and the Earth itself.