Ancient kauri trees capture last collapse of Earth’s magnetic field
By Paul Voosen, Science, February 18, 2021
Ancient Trees Show When The Earth's Magnetic Field Last Flipped Out
By Nell Greenfield-Boyce, Short Wave, NPR, February 18, 2021
Buried treasure - subfossil swamp kauri
By Kate Evans, New Zealand Geographic
Voosen, P., 2021, Kauri trees mark magnetic flip 42,000 years ago
Science. vol. 371, Issue 6531, pp. 766 DOI: 10.1126/science.371.6531.766
The paper is:
Cooper, A., Turney, C.S.M., Palmer, J. and others,
2021, Global environmental crisis 42,000 years ago
Science. Vol. 371, Issue 6531, pp. 811-818
Related paper
Staff, R.A., Hardiman, M., Ramsey, C.B., Adolphi,
F., Hare, V.J., Koutsodendris, A. and Pross, J., 2019.
Reconciling the Greenland ice-core and radiocarbon
timescales through the Laschamp geomagnetic
excursion. Earth and Planetary Science Letters, 520, pp.1-9.
Yours,
Paul H.