Fossils recovered from a cave in Casablanca, Morocco, may sit near the very root of the human family tree, according to researchers who date the remains to about 773,000 years ago. The bones, ...

Scientists revisiting mysterious 540-million-year-old microfossils from Brazil have overturned a major idea about early animal life. What were once thought to be trails left behind by tiny worm-like ...

More than 3.5 billion years ago, the Earth was not the hospitable world we know today. The atmosphere lacked oxygen, the seas were acidic and rich in iron, and volcanic activity roared across a barren ...

Roughly 500 million years ago, a strange event in the evolution of life on Earth seems to have taken place. The known fossil record from this time, which falls within the Cambrian period, contains a ...