Some 252 million years ago the world was going through a tumultuous period of rapid global warming.
, confirms eastern Australia was shaken by repeated"super eruptions" between 256 and 252 million years ago.
Today we see evidence of this in light-coloured layers of volcanic ash in sedimentary rock. These layers are found across huge areas of NSW and Queensland, all the way from Sydney to near Townsville.Our study has identified the source of this ash in the New England region of NSW, where the eroded remnants of volcanoes are preserved.
To put it into perspective, the 79 CE eruption of Mt Vesuvius, which obliterated the Italian city of Pompeii, produced just 3-4km³ of rock and ash. And the deadly Mt St Helens eruption in 1980 was about 1km³.east coast in ash – meters thick in some places. And a massive outpouring of greenhouse gases would have triggered globalAncient sedimentary rocks provide us with a timeline of the environmental damage caused by the eruptions. Ironically, the evidence is preserved in coal measures.
Typically the plant matter accumulated in swamps and was then buried under sediments. The burial process provided heat and pressure which enabled the conversion of the plant matter into coal.Without the forests, there was no plant matter to accumulate. The ecosystem collapsed and most animals became extinct.
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