The Remnants of a Lost ‘Supercontinent’ Just Rewrote the History of Life on Earth

Scientists have dug up an old argument about Earth’s past and, for once, the rocks seem to have the louder voice. A study in Science Advances says the submerged remnants of Gondwana show it was not just big, but a true supercontinent that covered roughly 80 percent of Earth’s land between 550 and 500 million years ago.

That matters because Gondwana sits right next to one of the biggest turning points in life’s history: the Cambrian explosion, which began about 538 million years ago. The new work argues that the rise of this giant landmass helped drive that burst of complexity, tying deep-Earth movement to the sudden spread of large, complex life.

The team, led by Tao Wang of the Chinese Academy of Geological Sciences, built the picture by pulling together more than 25,000 rocks from ancient continental fragments. Using AI and new methods as part of the Deep-time Digital Earth collaboration, they traced the origins of thousands of magmatic rocks and dropped them onto a global map of the deep past.

From there, the picture sharpened. Samarium and neodymium isotopes acted like fingerprints, revealing pieces of Gondwana now buried in younger rock. William Collins of Curtin University, who worked on the study, said the discovery was accidental: the group was not hunting for this supercontinent at all.

The geology also helps explain the climate story. The supercontinent formed alongside a tectonic belt stretching across 79 percent of Earth’s circumference, which boosted volcanic activity and pumped greenhouse gases into the air. That, the researchers say, helped pull the planet out of its Snowball Earth phase and set the stage for the big biological jump that followed.