The study of ancient geology and Earth's earliest geological processes, particularly the conditions and formations of the Archean Eon.
Compound of 'archaeo-' from Greek 'archaios' meaning 'ancient', 'geo-' from 'gaia' meaning 'earth', and '-logy' meaning 'study of'. It combines three concepts: ancient Earth study.
Archaeogeologists study rocks that are 4 billion years old to figure out what early Earth was actually like—they're basically reading Earth's oldest diary entries written in stone and mineral formations.
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