Age of oldest rocks off by millions of years - space - 29 March 2012 - New Scientist - 1 views
-
valerie taylor on 01 Apr 12"Two of the solar system's best natural timekeepers have been caught misbehaving, suggesting that the accepted ages for the oldest known rock samples are off by a million years or more. According to two new studies, a radioactive version of the element samarium decays much more quickly than previously thought, and different versions of uranium don't always appear in the same relative quantities in earthly rocks."