What the work claims
That all continents were once joined in a single landmass—‘Urkontinent’—and later drifted apart. That this explained the match in shape, rocks, and fossils across ocean basins.
How it was done
Wegener noticed the jigsaw fit of continental shelves—not coastlines—at 200 m depth. He presented this idea in a lecture on 6 January 1912. He compared rock types, geological structures, and fossil plants across Atlantic margins.
What holds up
The geometric fit at the continental shelf level holds. The fossil and geological similarities across the Atlantic hold. His inference—that continents were once joined—was correct, though unsupported by geophysical evidence in 1912.
What does not
Wegener did not identify a physical mechanism for drift. He did not measure motion. He did not cite seafloor spreading, magnetic reversals, or plate tectonics—none of which existed in his time.
Why it matters beyond the lab
It redefined Earth as dynamic, not static. It forced geology to confront evidence that contradicted prevailing theories—making it a masterclass in scientific dissent grounded in observation, not speculation.
Is it worth your time
Yes—if you want to understand how a bold, evidence-anchored hypothesis can precede its mechanism by decades. It demands no technical background, only attention to what was seen and where it led.
