Relating to or belonging to the Archean Eon, the earliest division of Earth's geological history spanning from about 4 billion to 2.5 billion years ago.
From 'archi-' (chief, primitive, first) combined with Greek 'zoios' (relating to life) or 'eos' (dawn). The term describes the most primitive and earliest period of life on Earth.
Archizoic rocks are genuinely ancient—they're from a time when Earth's atmosphere had almost no oxygen, the surface was constantly bombarded by meteorites, and yet somehow the first simple life forms managed to emerge in the oceans, which is absolutely mind-blowing when you think about the odds.
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