Update (29 January 2016): Three months after this report was published, its authors announced that an avoidable software error had led to a mistake in their analysis.
The ancient back-migration of Eurasians into Africa was limited to eastern Africa, they explained, and did not cover the entirety of the continent.
Basalt contains minute magnetic minerals that take on the direction of the Earth’s magnetic field at the time of eruption.
For more, see: 'Report that much of Africa has Eurasian ancestry is mistaken'.
A 4,500-year-old skeleton from a cave in Ethiopia has produced Africa’s first ancient human genome.
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The North American and Eurasian Plates are moving away from each other along the line of the Mid Atlantic Ridge.
The significance of the magnetic stripes was only revealed when their ages were discovered from dating magnetic reversals in volcanic rocks accessible on land.