Mass extinction event 2 billion years ago killed 99 percent of life on Earth, study says
September 03, 2019 at 08:38 AM EDT
There have been several mass extinction events during the planet's history, including the Cretaceous–Paleogene extinction event, arguably the best-known one because of the death of the dinosaurs. Now, researchers have discovered a new mass extinction event, one that happened 2.05 billion years ago and likely killed between 80 percent and 99.5 percent of all of life on Earth.