Rock samples from Quebec's Anticosti Island are offering new clues about Earth's first major mass extinction event 445 million years ago, suggesting that it may have been caused by a cooling climate.
TORONTO -- Rock samples from Quebec's Anticosti Island are offering new clues about Earth's first major mass extinction event, suggesting that it may have been caused by a cooling climate.
The researchers sought to investigate whether a lack of oxygen in the seawater, also known as anoxia, played a part in the mass extinction. Anoxia and global cooling are two of the prevailing hypotheses on the cause of the extinction event. "Upper-ocean oxygenation in response to cooling was anticipated, because atmospheric oxygen preferentially dissolves in cold waters,” said lead author Alexandre Pohl in a news release.
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