Ancient rocks reveal how Earth recovered from mass extinction
http://phys.org/news/2016-07-ancient-reveal-earth-recovered-mass.html
Scientists have shed light on why life on Earth took millions of years to recover from the greatest mass extinction of all time.
The study provides fresh insight into how Earth's oceans became starved of oxygen in the wake of the event 252 million years ago,
delaying the recovery of life by five million years.
Findings from the study are helping scientists to better understand how environmental change can have disastrous consequences for
life on Earth. The Permian-Triassic Boundary extinction wiped out more than 90 per cent of marine life and around two thirds of
animals living on land. During the recovery period, Earth's oceans became starved of oxygen - conditions known as anoxia.
Previous research suggested the mass extinction and delayed recovery were linked to the presence of anoxic waters that also
contained high levels of harmful compounds known as sulphides.
