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Ancient Northland swamp kauri solves 42,000 year old mystery
NZ Herald: Ancient Northland swamp kauri shows breakdown of Earth's magnetic field 42,000 years ago.
"For the first time ever, we have been able to precisely date the timing and environmental impacts of the last magnetic pole switch," Chris Turney, a professor at UNSW Science and co-lead author of the study said.
"The findings were made possible with ancient New Zealand kauri trees, which have been preserved in sediments for over 40,000 years. Using the ancient trees we could measure, and date, the spike in atmospheric radiocarbon (the radioactive isotope or type of carbon) levels caused by the collapse of Earth's magnetic field."”
Source: www.nzherald.co.nz
ancient kauri magnetic northland swamp nz trees date
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