Relating to the Archean Eon, the earliest geological time period when Earth's crust first formed, roughly 4 to 2.5 billion years ago.
From Greek 'arche' (beginning) plus '-an.' This geological term was formalized in the 19th century to denote the most ancient rocks and the oldest era of Earth's history.
When geologists discovered rocks over 3 billion years old, they named the era 'Archean' because it literally meant 'of the beginning'—it's Earth's birth certificate written in stone and revealed through radiometric dating!
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