250 million years of transformation
How the face of our planet has been ceaselessly rewritten
The Theory
Continental drift is the hypothesis that Earth's continents have moved over geologic time relative to each other, thus appearing to have "drifted" across the ocean bed. The speculation that continents might have shifted position over time is ancient, but the idea was revived in the early 20th century by Alfred Wegener.
Wegener presented a large body of circumstantial evidence in support of continental drift, but was unable to provide a convincing mechanism. It was not until the 1950s and 60s that the theory of plate tectonics emerged to explain the driving force.
"Does not the east coast of South America fit exactly against the west coast of Africa, as if they had once been joined?"— Alfred Wegener, 1912
Geologic History
The first known supercontinent forms. Nearly all of Earth's landmass assembles into a single mass centered near the equator. A vast global ocean — Mirovia — surrounds it entirely.
Rodinia breaks apart and reassembles into Pannotia — a shorter-lived supercontinent. The fracturing coincides with the Snowball Earth glaciation events. Life remains confined to the oceans.
The most famous supercontinent assembles. A single enormous ocean — Panthalassa — covers nearly 70% of the planet. Dinosaurs roam freely across all connected landmasses. The climate is dramatically warmer.
Pangaea cleaves into two massive pieces — Laurasia in the north (proto North America, Europe, Asia) and Gondwana in the south (proto Africa, South America, Antarctica, Australia, India).
The continents reach their current configuration. The Atlantic Ocean continues to widen 2.5 cm/year. The Americas drift westward. Africa and Europe inch toward each other. The Pacific shrinks. The story is not over.
Scientific Proof
Identical fossils of Mesosaurus (a freshwater reptile), Glossopteris (a fern), and Lystrosaurus (a land animal) are found on continents now separated by thousands of miles of ocean — impossible unless those continents were once joined.
The eastern coast of South America and western coast of Africa fit together with remarkable precision — not just visually, but also at the continental shelf (the true edge of the continent, 200m below sea level).
Identical rock formations, ages, and mineral compositions appear on opposing continental edges. The Appalachian Mountains align with the Scottish Highlands and the Atlas Mountains of Morocco when the continents are reassembled.
Coal deposits (requiring tropical forests) are found in Antarctica. Glacial striations exist in tropical Africa. Ancient desert sandstones appear in Britain. Each region's past climate is explained only by its former position on the globe.
Magnetic reversals recorded symmetrically on either side of mid-ocean ridges proved that new crust is continuously created at spreading centers. Harry Hess's 1960 discovery provided the missing mechanism Wegener lacked.
Modern satellite geodesy directly measures continental motion. North America moves ~2.3 cm/year from Europe. India crashes into Asia at ~5 cm/year, raising the Himalayas 5mm annually. The drift is live and observable.
Interactive Visualization
Select an era to see how the landmasses were arranged. Each configuration shaped the evolution of life, climate, and ocean currents of its time.
Select an era
The Visionary
A German meteorologist and polar explorer, Wegener formally proposed the theory of continental drift in 1912. His idea — that continents were once a single landmass — was ridiculed by the geological establishment of his day.
Without a viable mechanism to explain how continents could plow through the ocean floor, his theory was largely rejected for 50 years. He died on the Greenland ice sheet in 1930 during his fourth Arctic expedition, his greatest hypothesis still unproven.
What comes next
Geologists predict that in roughly 250 million years, a new supercontinent — sometimes called Amasia or Pangaea Proxima — will form as the Americas collide with Asia, and Africa merges with Europe. The Atlantic may close. The story of Pangaea is not history — it is a cycle.