Eoarchean
From Freepedia
| Eoarchean era |
|---|
| Geologic timescale of the Precambrian |
| (millions of years ago) |
|
<timeline> ImageSize = width:175 height:355 PlotArea = left:40 right:5 bottom:105 top:45 AlignBars = justify Period = from:3500 till:3800 TimeAxis = orientation:vertical ScaleMajor = unit:year increment:100 start:3500 ScaleMinor = unit:year increment:25 start:3500 Colors = id:eon value:rgb(1,0.7,1) legend:Archaean_eon # light purple id:era value:rgb(1,1,0.7) legend:Eoarchean_era # light yellow id:period value:rgb(1,0.7,0.7) legend:Period # light red id:black value:black Legend = left:15 top:60 BarData = bar:eon bar:era bar:period PlotData= width:80 align:center textcolor:black mark:(line,black) bar:eon color:eon from:start till:end width:100 at:3550 mark:none text:Archaean~(2500-3800) bar:era color:era from:3600 till:3800 text:Eoarchean~(3600-3800) bar:period color:period TextData = tabs:(25-left) pos:(15,350) text:"Preceded by:" text:^Hadean eon pos:(15,95) text:"Followed by:" text:^Paleoarchean era </timeline> (expand) |
In the geologic timescale, the Eoarchean was an era that lasted from 3800 Ma to 3600 Ma (million years ago). It is the first part of the Archaean Eon. During this era, prokaryotes (simple single-celled life) are thought to have originated. The Hadean eon was prior to the Eoarchean. In chronostratigraphy, its zone rank is an erathem.
The International Commission on Stratigraphy does not recognize the lower boundary of the era nor the preceding Hadean Eon.
The Eoarchean was followed by the Paleoarchean era.
The name comes from two Greek words: eos (dawn) and archios (ancient).
| Archean eon | |||
|---|---|---|---|
| Eoarchean | Paleoarchean | Mesoarchean | Neoarchean |
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