Ancient tree recorded Earth reversing magnetic field


Nelson Parker

An ancient tree that contains a record of a reversal of Earth’s magnetic field has been discovered in New Zealand. The tree—an Agathis australis, better known as its Māori name kauri—was found in Ngawha, on New Zealand’s North Island, during excavation work for the expansion of a geothermal power plant…

The tree, which had been buried in 26 feet of soil, measures eight feet in diameter and 65 feet in length. Carbon dating revealed it lived for 1,500 years, between 41,000 and 42,500 years ago…

❝ The lifespan of the kauri tree covers a point in Earth’s history when the magnetic field almost reversed. At this time, the magnetic north and south went on an excursion but did not quite complete a full reversal.

Looking forward to a polished picture of the tree rings.

Thanks, UrsaRodinia

2 thoughts on “Ancient tree recorded Earth reversing magnetic field

  1. Mike says:

    The earth’s magnetic poles have reversed regularly over Earth’s 4.54 billion years of existence. During the age of dinosaurs, Earth’s magnetic poles flipped about once every million years. More recently, pole reversals have happened once every 200,000 to 300,000 years or so. It’s been about 780,000 years since the last magnetic pole reversal, which suggests that one is geologically imminent.
    For the last 170 years, a mysteriously weak patch of Earth’s magnetic field has grown in size, causing some geologists to think that the planet is gearing up to flip its magnetic poles. Now, buildings that were ritually burned down in Africa more than a thousand years ago are adding vital new clues to the case. (National Geographic, March 2018) https://news.nationalgeographic.com/2018/03/earth-magnetic-field-south-atlantic-anomaly-africa-science/ See also “The South Atlantic Anomaly: The Key for a Possible Geomagnetic Reversal” (2016) https://www.frontiersin.org/articles/10.3389/feart.2016.00040/full

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