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Alfred Wegener
1880–1930; continental drift 1912· Scientist· Earth, climate & extinctions
Well establishedStrong fossil, genetic or geological evidence.
German meteorologist and polar explorer who proposed in 1912 that the continents drift across Earth's surface.
See it on the Life map →What happened
Wegener noticed that South America and Africa fit together like puzzle pieces, then gathered more clues: matching rock layers, fossils such as Glossopteris on continents now far apart, and traces of ancient glaciers in today's tropics. He argued all continents once formed one supercontinent, Pangaea, which broke apart. His 1915 book was widely rejected, mostly because he could not show what force moved continents. He died on the Greenland ice sheet in 1930, decades before plate tectonics vindicated him.
Why it matters
He assembled the first strong case that continents move, an idea that, once explained by plate tectonics, transformed geology and the study of life's history.
Discoveries and legacy
His book The Origin of Continents and Oceans (1915, revised through 1929). Later seafloor and magnetic data confirmed drift, though not the mechanism he proposed.
Still debated
Historians debate why rejection was so fierce, especially in the U.S.: a weak mechanism, his outsider status as a meteorologist, or plain conservatism.
Connections (2)
▸Glossopteris supplied key fossil evidence to Alfred WegenerWell established
The connection
Glossopteris, a seed fern with tongue-shaped leaves, left fossils in South America, Africa, India, Australia and Antarctica. Its large seeds could not have crossed oceans. Wegener argued that the simplest explanation was that these lands had once been joined, rather than linked by land bridges that later sank, as many geologists then proposed.
When and how
Wegener's 1915 book; Antarctic Glossopteris fossils were among the rocks hauled by Robert Falcon Scott's doomed polar party in 1912 and found with their bodies.
The evidence
Fossil collections on five southern landmasses; later dating and magnetic data confirmed these lands formed Gondwana until it began breaking up about 180 million years ago.
Debates and open questions
Little doubt remains about the link itself; botanists still debate exactly which other seed plants Glossopteris was related to.
▸Alfred Wegener launched the idea of Continental drift & plate tectonicsWell established
The connection
Wegener's continental drift was widely rejected because he could not explain what force moved continents. After World War II, ocean-floor mapping revealed mid-ocean ridges and magnetic stripes. In the 1960s Harry Hess proposed seafloor spreading and others confirmed it, turning drift into plate tectonics. Continents ride on plates; they do not plow through the seafloor as Wegener thought.
When and how
Wegener's lecture in Frankfurt, January 1912; Marie Tharp and Bruce Heezen's seafloor maps in the 1950s; Hess (1962) and Vine and Matthews (1963).
The evidence
Magnetic stripes mirror each other across ridges, drilling from 1968 showed seafloor gets older away from ridges, and GPS now measures plate motion directly.
Debates and open questions
How much credit Wegener deserves given his wrong mechanism; Arthur Holmes had proposed mantle convection as the driver by 1929.