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References
Bowring, S. 2014. Early earth: Closing the gap. Nature Geoscience, 7(3), 169-170.
http://www.nature.com/ngeo/journal/v7/n3/full/ngeo2100.html
O'Neil, J., Carlson, R. W., Francis, D., & Stevenson, R. K. (2008). Neodymium-142 evidence for Hadean mafic crust. Science, 321(5897), 1828-1831.
http://courses.washington.edu/bangblue/ONeil-Oldest_Rock_4.28Ga-Sci08.pdf
Valley, J. W. et al. 2014. Hadean age for a post-magma-ocean zircon confirmed by atom-probe tomography. Nature Geoscience, 7(3), 219-223.
http://www.nature.com/ngeo/journal/v7/n3/abs/ngeo2075.html