Atom probe assisted dating of oldest piece of earth

(Phys.org) —It’s a scientific axiom: big claims require extra-solid evidence. So there were skeptics in 2001 when University of Wisconsin-Madison geoscience professor John Valley dated an ancient crystal found in Australia to 4.4 billion years ago. The date, after all, was only 100 million years after Earth started to solidify from a ball of molten rock.

from Phys.org: Physics News http://ift.tt/1h4vq1B

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