
Radiocarbon from a 42,000-year-old kauri tree in New Zealand helped unravel Earth’s last magnetic upheaval. JONATHAN PALMER
Science magazine is accessible for most lay readers, even if their articles occasionally include a word we have never heard of, such as paleomagnetist:
Ancient kauri trees capture last collapse of Earth’s magnetic field
Several years ago, workers breaking ground for a power plant in New Zealand unearthed a record of a lost time: a 60-ton trunk from a kauri tree, the largest tree species in New Zealand. The tree, which grew 42,000 years ago, was preserved in a bog and its rings spanned 1700 years, capturing a tumultuous time when the world was turned upside down—at least magnetically speaking. Continue reading


























