As the time line at right shows, hundreds of times in our planet's history the polarity of the magnetic shield ensheathing the globe has gone from "normal," our current orientation to the north ...

The first geomagnetic polarity time scale that covered the entire Cenozoic era was constructed in the early days of the plate tectonic revolution in the late 1960s from a few carefully selected marine ...

This method uses the orientation of the Earth's magnetic field, which has changed through time, to determine ages for fossils and rocks. Relative dating to determine the age of rocks and fossils ...