Earth's magnetic field was so weak it almost disappeared. Then, seemingly out of nowhere, complex life emerged.

marcelosanchezi date back to approximately 50 million years ago, during the Eocene epoch ... to the higher temperatures in this period of the Earth’s history,” said co-author Krister Smith ...

The origin of reptiles on Earth has been shown to be up to 40 million years earlier than previously thought -- thanks to evidence discovered at an Australian fossil site that represents a critical ...

Scientists revisited tracks made by a shorebird, a lizard, a cat-like predator and some sort of large herbivore at what is now John Day Fossil Beds National Monument ...

Their careful work revealed a clear ~12-degree tilt of Earth's crust and mantle about 84 million years ago. But that wasn’t all. The data showed that after tipping over, Earth corrected itself ...