We will first review what is known from historical measurements of the geomagnetic field.
Then we will turn to what we can glean from accidental records made by archaeological and geological materials.
The earliest evidence of writing anywhere in the world only goes back about 5000 years.
Paleoanthropologists frequently need chronometric dating systems that can date things that are many thousands or even millions of years older.
As I stated previously this notion isn't anything new and had been proposed many times in the past.
What made Wegner's hypothesis different was not that he had finally discovered the process but the vast ammount of evidence he collected.
The geomagnetic field changes on frequencies of 10s of microseconds (radio waves) to millions and perhaps billions of years.
What Seuss noticed was that fossils of an extinct plant known as glossopteris could be found in many locations, including: India, Australia, South Africa, and South America.
Furthermore, Wegner proposed that around 200 million years ago Pangea began breaking apart and the continents slowly drifted to their present position.
So what made Wegner so different from everyone else?
It interacts with the atmosphere, the biosphere, the deep mantle and even the inner core.
The magnetic field is one component of the highly complex Earth system.
Although the idea had been suggested many times before none of the early hypothesis was ever capable of explaining how continents might be capable of drfited to their present location.