3 min read The Cambrian period, part of the Paleozoic era, produced the most ... the world's oceans until they were wiped out in the Permian extinctions about 250 million years ago.
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Carbon dioxide has been regulating Earth's climate for hundreds of millions of years—new studyThe Late Paleozoic ice age has long been a climate ... million years ago around the boundary between the Carboniferous and Permian periods. The low atmospheric CO₂ combined with less heat ...
Permian, North America, Europe ... Phylogeny of the Echini, with a revision of Paleozoic species. Memoirs of the Boston Natural History Society 7, 443 pp, 76 pls.
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