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India at the Turn of the Century | india histoy bast Blog

January 22, 2020

India at the Turn of the Century

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PLANET EARTH GLOBAL EYE | Supernova sparked mass extinction 359 million years ago | Stone forests formation

supernova sparked mass extinction 359 million years ago A global extinction event that occurred around 359 million years ago may have been triggered by the death blast of a distant star. Towards the end of the Devonian Period, 416 million to 358 million years ago, there was a mass extinction known as the Hilgenberg event; it wiped out armored fish called placoderms and killed off approximately 70 per cent of Earth’s invertebrate species. But scientists have long puzzled over what caused the event. Recently preserved plant spores offered clues about this ancient extinction. Fossil spores spanning thousands of years at the boundary of the Devonian and the Carboniferous periods showed signs of damage caused by ultraviolet (UV) light. This find suggested that a cataclysmic event had caused a long-lasting disruption of Earth’s ozone layer, which shields the planet from harmful UV rays. Scientists proposed that a likely candidate for this blast of UV light could be

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