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The Authors
For lot's more videos on soil moisture topics, see Drs Selker and Or's text-book support videos https://www.youtube.com/channel/UCoMb5YOZuaGtn8pZyQMSLuQ/playlists
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Category Archives: palaeomagic
Remagnetisation spoils the paleomagnetic party again
Did the Earth have a magnetic field before 3.5 billion years ago? Previous paleomagnetic studies of the world’s oldest mineral grains – the Jack Hills zircons, which have maximum ages of 4.4 billion years – claimed that tiny inclusions of … Continue reading
How long was the last magnetic reversal – and why might subducting slabs have had a say in what it looked like?
A new paper on the chronology of the last magnetic reversal concludes it took 20,000 yrs, and there were two distinct excursions – where the field becomes weak and disorganized, but it recovers without reversing polarity – before the main event about … Continue reading
A very slow magnetic doom
Why an ‘imminent’ reversal of the Earth’s magnetic field doesn’t mean what most people think it means. Continue reading
Reconstructing ocean spreading when half your record is now in the mantle (or: a plug for my new paper)
If you’re studying the last 100 million years or so of plate tectonics, the history of sea-floor spreading recorded by the magnetic stripes that parallel and extend away from the Earth’s ocean ridges is a key source of information. Each … Continue reading
Scenic Saturday: our stripy oceans, explained 50 years ago today!
A slightly different Scenic Saturday this weekend, as we celebrate an important milestone in geological science: a look at the South Pacific through a geophysical lens. The colours on this map show fluctuations in the Earth’s magnetic field produced by … Continue reading
Nice plan for content warnings on Mastodon and the Fediverse. Now you need a Mastodon/Fediverse button on this blog.