Relating to or denoting the earliest period of Earth's history when life first appeared, also called the Archean or Precambrian era.
From Greek 'eos' (dawn/beginning) plus 'zoic' (from 'zoe' meaning life), literally meaning 'relating to the dawn of life' on Earth.
When geologists use 'eozoic,' they're talking about rocks so old that they predate even the fossils in the Cambrian explosion—we're talking about the first 4 billion years of Earth's story.
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