A massive 1,700-year-old ancient kauri tree reveals....

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A massive 1,700-year-old ancient kauri tree, unearthed from a New Zealand swamp in Ngāwhā, lived approximately 41,000–42,500 years ago during the "Laschamp Excursion". Preserved in waterlogged soil, this 65-foot-long, 8-foot-diameter trunk provided crucial data on Earth's magnetic field weakening to 0–6% strength, acting as a record of that cosmic event.
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  • Discovery Context: The tree was discovered during a geothermal plant expansion in Northland, New Zealand, and is considered a "time capsule" of Earth’s climate history.
  • Scientific Significance: Researchers, including those from the University of New South Wales (UNSW), used the tree's growth rings to map the "Adams Event," a period of intense cosmic radiation and climate upheaval.
  • The Findings: The data indicates that during this period of magnetic instability, the ozone layer was depleted, leading to dramatic environmental changes like expanding ice sheets, shifting storm patterns, and desertification in Australia.
  • Cultural Importance: For the Māori, these ancient trees possess mauri (life essence) and are regarded as descendants of the forest god Tāne Mahuta.
  • Age and Preservation: The tree itself lived for over 1,700 years before being buried and preserved in the swamp for over 40,000 years.
    Earth Sciences New Zealand | NIWA +6
The study, led by scientists such as Professor Chris Turney, highlights the fragility of Earth's magnetic field and its impact on the planet's history.
Earth Sciences New Zealand | NIWA +2
 
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