Figure 22. Geomagnetic polarity over the past 169 million years, trailing off into the Jurassic Quiet Zone. Dark areas denote periods of normal polarity, light areas denote reverse polarity. Credit: Public domain

From

MODIFIED THEORY OF RELATIVITY (MTR)

Bjarne , Linda M. Lorenzen

Frontiers of Astronomy, Astrophysics and Cosmology. 2018, 4(1), 32-53