Geologists discover rocks with the oldest evidence yet of Earth’s magnetic field.

[Oxytropidoceras]

Geologists discover rocks with the oldest evidence yet

of Earth’s magnetic field. The 3.7 billion-year-old rocks

may extend the magnetic field’s age by 200 million years.

Jennifer Chu | MIT News, April 24, 2024

 

Ancient Rocks Reveal Earth's Magnetic Field Existed

3.7 Billion Years Ago, Science Alert, April 27, 2024

 

The open access paper is:

 

Nichols, C.I., Weiss, B.P., Eyster, A., Martin, C.R., Maloof,

A.C., Kelly, N.M., Zawaski, M.J., Mojzsis, S.J., Watson,

E.B. and Cherniak, D.J., 2024. Possible Eoarchean records

of the geomagnetic field preserved in the Isua Supracrustal

Belt, southern west Greenland. Journal of Geophysical

 Research: Solid Earth, 129(4), p.e2023JB027706.

 

Yours,

 

Paul H.