Relating to the earliest period of the Devonian Era in geological history, roughly 419 to 393 million years ago.
From eo- (early) plus Devonian (named after Devonshire, England where the rocks were first studied). Denotes the early part of this geological period.
The Eodevonian is wild because it's when fish were evolving legs—you can literally trace how fins became limbs in the fossils from this period, watching evolution transition from sea to land.
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