Geomagnetic Polarity Time Scale (GPTS)
Definition - What does Geomagnetic Polarity Time Scale (GPTS) mean?
Geomagnetic Polarity Time Scale is a report of the duration and onset of multitude of the episode of the reversal of magnetic polarity of the Earth or the geomagnetic polarity reversal. The scale was developed after a complete study of the rocks in the world. During the study, the rocks were observed to contain magnetic minerals from a specific time period. The magnetic minerals had an orientation opposite to the orientation of the present magnetic field. The approximate age of the rocks can be measured by comparing patterns of the magnetic reversal with the rocks of a known age.
Petropedia explains Geomagnetic Polarity Time Scale (GPTS)
The Geomagnetic Polarity Time Scale is the list of the dates of the prior geomagnetic polarity reversal. It was constructed from the analysis of the magnetic abnormalities measured off the ocean basins and by tying these abnormalities to the dated and known magnetic reversal found on the land. It is principally useful in the basalts of oceanic crust that record the magnetic field of the Earth as they get solidified from the molten lava uniformly in the mid-oceanic ridges. It has been precisely drawn out back to the Upper Jurassic, which is the age of the earliest existing oceanic crust.