Mutated ferns shed light on ancient mass extinction

At the end of the Triassic around 201 million years ago, three out of four species on Earth disappeared. Up until now, scientists believed the cause of the catastrophe to be the onset of large-scale volcanism resulting in abrupt climate change. Now, an international research team has found a contributing cause: poisoning by mercury emitted by the volcanoes.
Paleontology News — ScienceDaily

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