BBC NEWS | Science/Nature | Poison gas 'caused' great dying: "Poison gas 'caused' great dying
Sulfur dioxide and other volcanic gases rise from the Pu'u 'O'o vent on Kilauea Volcano, Hawaii, in 1995 Photo: US Geological Survey
The continent-wide nature of the event implies that it was caused by something in the atmosphere
Dr Mark Sephton, Imperial College London
The Earth's greatest mass extinction was probably caused by poisonous volcanic gas, according to a study published in the journal Geology.
This 'great dying' 250 million years ago killed off more than two-thirds of reptile and amphibian families."
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