Wow - Complicated sentences and big new words! LOL:
Paleomagnetism is the study of the record of the Earth's magnetic field in rocks, sediment, or archeological materials. Certain minerals in rocks lock-in a record of the direction and intensity of the magnetic field when they form. This record provides information on the past behavior of Earth's magnetic field and the past location of tectonic plates. The record of geomagnetic reversals preserved in volcanic and sedimentary rock sequences provides a time-scale that is used as a geochronologic tool.
OK, So we do have some measure back into history of the earth/s pole reversals and some measure of magnetic field intensity over time.
If it hasn't happened in 780,000. but has shown a repeat pattern of reversing on average 300,000 years,
How accurate are these numbers?
And when it changes, Does it just flip quickly or slowly?