The first five mass extinctions
Are we heading for Earth’s sixth mass extinction? Let’s check out the tell-tale signs from the previous five.
447 to 443 million years ago
The first mass extinction was caused by protocontinent Gondwana moving towards the South Pole, leading to global cooling, glaciation and a drop in sea level. Most life at the time was marine, and about 85 per cent of it vanished.
375 to 360 million years ago
About 70 per cent of all species died in a series of extinction pulses. Marine life was particularly hard hit, with coral reefs disappearing almost entirely. The cause is unclear – possibly global cooling due to oceanic volcanism.
252 million years ago
The worst extinction event, killing 90 to 96 per cent of species. The cause is debated but could have been a meteorite, volcanism or methane release that led to rapid climate change. Life took about 10 million years to recover.
201.3 million years ago
Between 70 and 75 per cent of the Earth’s species went extinct at the end of the Triassic, including many large reptiles and amphibians. The cause is unknown, but the empty niches allowed dinosaurs to proliferate in the Jurassic.
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66 million years ago
This is probably the most famous mass extinction – it’s the asteroid impact that killed off the dinosaurs and about 75 per cent of species. Since then, birds and mammals have evolved to become the dominant land species.
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