Earth's Magnetic Field Almost Collapsed 565 Million Years Ago
Our planet's core probably started solidifying in the late Ediacaran
period, which recharged the magnetic field in the nick of time.
https://motherboard.vice.com/en_us/article/9kpywp/earths-magnetic-field-collapse-ediacaran-core-solidification
https://www.newsweek.com/earth-magnetic-field-collapse-inner-core-solid-geodynamo-solar-wind-1307659
The (paywalled) papers are:
Richard K. Bono, John A. Tarduno, Francis Nimmo & Rory D. Cottrell
2019. Young inner core inferred from Ediacaran ultra-low
geomagnetic field intensity. Nature Geoscience 12, pages 143–147.
https://www.nature.com/articles/s41561-018-0288-0
Peter Driscoll, Geodynamo recharged
Nature Geoscience 12, pages 83–84
https://www.nature.com/articles/s41561-019-0301-2
It is strange how so many odd things occurred during the Ediacaran
period. One question is how did this along with everything else
did or did not affect evolution of plants and animals?
Yours,
Paul H.