question archive The distinction between eons is based on very broad planetary developments, like the formation of an oxygenated atmosphere or the emergence of multicellular life
The distinction between eons is based on very broad planetary developments, like the formation of an oxygenated atmosphere or the emergence of multicellular life
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The distinction between eons is based on very broad planetary developments, like the formation of an oxygenated atmosphere or the emergence of multicellular life. For example, the Phanerozoic eon reflects all time in earth's history since the appearance of shells in the fossil record. Other subdivisions of the geologic time scale (including eras, periods, and eons) require more specific observations based on the existence of specific species or geochemical conditions. Why do you think there are no subdivisions for the Hadean, Archean, or Proterozoic eons?
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