The Great Dying: When Earth nearly lost all complex life

Space · Published 24 October 2026 Swipe more like this →

In short: 252 million years ago, a cataclysmic event known as the Great Dying wiped out over 80% of all species. This wasn't just a local disaster; it was a global apocalypse that nearly pushed complex life to total annihilation, fundamentally altering the course of evolution for the next 250 million years.

During the Permian Period, the Earth was dominated by a massive supercontinent called Pangea. This single landmass was surrounded by a vast, deadly superocean known as Panthalassa. The geography of this era created extreme environmental pressures, including vast deserts in the interior of the supercontinent and powerful monsoons along its coasts. These harsh conditions set the stage for one of the most violent shifts in planetary history.

The shift between the Early Triassic and Late Permian signifies a geological divide defining the most severe extinction event on record. This period of rapid climate change caused the flourishing ecosystems of the Permian to vanish almost entirely from the fossil record. In the desolation that followed, only a few surviving branches of the tree of life remained, leaving a bleaker world that dictated the biological makeup of the Mesozoic era.

The mechanism behind this catastrophe was a rapidly changing climate that triggered a global collapse. While the specific geological triggers are complex, the result was a 'Great Dying' that nearly extinguished complex life. Today, we can still see the effects of this event in our current evolutionary lineage, as the survivors of this era were the ancestors of the life forms that eventually populated the planet.

Geology provides the physical evidence for this era. Scientists can identify specific rock layers deposited during the Great Dying, which serve as a stark boundary between the Paleozoic and Mesozoic eras. These layers act as a permanent record of a time when the planet's biodiversity was systematically dismantled by environmental upheaval.

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