Around 252 million years ago, the world experienced a mass extinction, killing ninety percent of all animal and plant species in the world’s oceans. This event, called the Permian-Triassic mass extinction, at the end of the Permian Age had consequences beyond simple loss of species: In the following five million years, the pattern of the global distribution of biodiversity appeared to be very different from those before and after this time period.
Click here for original story, Extreme environmental conditions can lead to a massive global reshuffling of biodiversity
Source: Phys.org