Siberian volcanic eruptions caused extinction 250 mn yrs ago
US-based scientists have found the Great Permian Extinction, which lead to the disappearance of 90% of then-present species 250 million years ago, was caused by massive volcanic eruptions in Siberia. The study based its claims on evidence of a spike in nickel deposits in regions ranging from the Arctic to India during the extinction period, also concurrent with carbon-emitting eruptions.