Did Microbes Cause The Earth's Most Devastating Mass Extinction?

A little over 250 million years ago, our planet experienced a mass extinction the likes of which have never been seen before or since. About 90% of all species were suddenly wiped out. And new study suggests it wasn't caused by an asteroid or super-volcano — but rather methane-spewing microbes. » 3/31/14 12:00pm 3/31/14 12:00pm

Was Earth's most devastating mass extinction caused by a single microbe?

That's the intriguing new hypothesis put forward to explain the Permian mass extinction, which wiped out more than 90% of all Earth's species 251 million years ago. And we even know which microbe is responsible for this omnicidal annihilation. » 12/16/12 1:30pm 12/16/12 1:30pm

How massive volcanoes and supercharged greenhouse gases almost wiped…

About 250 million years ago, the world suffered through an extinction event that makes the death of the dinosaurs look like a minor hiccup by comparison. And now we have our best understanding yet of what caused the Great Dying. » 1/23/11 1:15pm 1/23/11 1:15pm

Meet the reptilian predator that's older than the earliest dinosaurs

This is Dimetrodon, the world's top predator about 270 million years ago. Living before the dawn of the dinosaurs, this striking creature was actual a distant ancestor of mammals like us. Now we've discovered the most complete Dimetrodon skeleton ever. » 12/06/10 7:04pm 12/06/10 7:04pm

Why did nearly all life on Earth die 250 million years ago?

Among paleontologists, it's sometimes called the "Great Dying." Roughly a quarter of a billion years ago, 90-95 percent of all life on Earth died out. It took 30 million years for the planet to recover. What happened? » 6/09/10 7:44pm 6/09/10 7:44pm