Relating to or denoting the earliest period of the Carboniferous Era in geological history, roughly 359 to 323 million years ago.
From eo- (early) plus Carboniferous (the geological period named for its coal deposits). Indicates the early part of this coal-forming era.
The Eocarboniferous is when giant insects ruled the air and the first reptiles crawled out of swamps—the carbon trapped then became the coal we burn today, making this ancient period directly fuel our present.
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