Comment by thangalin

https://impacts.to/downloads/lowres/impacts.pdf#page=23

Quoting my book:

"Studying these layered strata is known as magnetostratigraphy and can be used to verify radioactive dating methods. Geologists used magnetostratigraphy to cross-check the dates of the Nakali Formation, where Nakalipithecus nakayamai’s jaw was found."