Relating to the earliest period of the Paleozoic Era in geological time, spanning from approximately 541 to 485 million years ago.
From Greek 'eos' (early, dawn) + 'palaios' (ancient) + 'zoikos' (of animals), combined into a geological time descriptor. This variant spelling reflects older English conventions.
During the Eopalaeozoic period, every animal on Earth lived in the oceans, and all the land was completely barren and lifeless—it's almost impossible to imagine a world with such a complete divide!
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