Relating to the earliest part of the Paleozoic Era in Earth's geological history, characterized by the emergence of most major animal groups.
From Greek 'eos' (early, dawn) + 'palaios' (ancient) + 'zoikos' (of animals). A modern spelling variant of 'eopalaeozoic,' using simplified English spelling conventions.
Life literally exploded during the Eopaleozoic with the Cambrian Explosion—in just a few million years, almost every animal body plan that ever existed appeared in the fossil record, which still mystifies scientists!
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