2,500–538.8 million years ago
What happened during this time?
Increasing complexity of life
The first multicellular organisms
Molecular clock analyses have estimated the origin of the green algae lineage between 700 and 1,500 mya (Douzery et al. 2004, Hedges et al. 2004, Berney and Pawlowski 2006, Roger and Hug 2006, Herron et al. 2009)
Continental drift, in its present form, begins to happen
The build-up of large continents and orogeny (mountain building), with modern plate tectonics
Land had grown and become stable enough to allow large inland seas, and strata deposited in these areas is relatively well preserved.
The gradual change in the atmosphere with the build up of oxygen
Several ice ages
Snowball Earth event(s)
Precambrian "Pangaea" event