They wouldn't have encountered a speck of ice; even before the events we're talking about, Earth was already much warmer than it is today. But as the Paleocene epoch gave way to the Eocene ...

Can’t? Allow us to refresh your memory: it was the Paleocene-Eocene Thermal Maximum, a 200,000-year period of rapid carbon release and global warming that turned Earth's oceans acidic and saw ...

For more than 140 years, Mixodectes pungens, a species of small mammal that inhabited western North America in the early Paleocene, was a mystery. What little was known about them had been mostly ...