Earth History
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Reference Material
#1 Geologic Time
#2 Archean Time, Origins of Life
#3 Proterozoic Time
#4 Cambrian "Explosion"
#6 Plate Tectonics & Reefs
Reference Material
Click
HERE
to see a chart of the main Eras in Earth History. This timeline uses two abbreviations
Ma = MegaAnnus or Millions of Years
Ga = GigaAnnus or Thousand Million years
HERE
is a chart showing Reef Builders through Geologic Time.
We can add more material here