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The burial dating relies on measuring radioactive isotopes aluminum-26 and beryllium-10 in quartz within the rock.
These isotopes are only created when the rock is exposed to cosmic rays.
When it is buried or deposited in a cave, the isotopes decay at known rates.
The new date places Little Foot as an older relative of Lucy, a famous Australopithecus skeleton dated at 3.2 million years old that was found in Ethiopia.
It is thought that Australopithecus is an evolutionary ancestor to humans that lived between 2 million and 4 million years ago.
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