Dating early human middens becomes uncertain beyond 50,000 years, when radiocarbon dating ceases to be useful. Uranium-series dating of marine shells and bone is uncertain by some 10% because of the structure of these materials. A team has now improved the method for a more stable discard: ostrich eggshells. The method extends the accuracy and precision of radiocarbon 10 times into the past, to about 500,000 years ago.
from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/04/210430093136.htm
from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/04/210430093136.htm
Discarded ostrich eggshells provide timeline for our early African ancestors
![Discarded ostrich eggshells provide timeline for our early African ancestors]()
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April 30, 2021
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