Table of Contents

Articles

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  Uranium isotopes in soils as a proxy for past infiltration and precipitation across the western United States

  Kate Maher, Daniel E. Ibarra, Jessica L. Oster, David M. Miller, Joanna L. Redwine, Marith C. Reheis and Jennifer W. Harden

  American Journal of Science April 2014, 314 (4) 821-857; DOI: https://doi.org/10.2475/04.2014.01
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  MgAl₂O₄–Al_8/3O₄ spinels: Formulation and calibration of the low-pressure thermodynamics of mixing

  Richard O. Sack

  American Journal of Science April 2014, 314 (4) 858-877; DOI: https://doi.org/10.2475/04.2014.02
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  Plate tectonics before 2.0 Ga: Evidence from paleomagnetism of cratons within supercontinent Nuna

  Ross N. Mitchell, Wouter Bleeker, Otto van Breemen, Tony N. Lecheminant, Peng Peng, Mimmi K. M. Nilsson and David A. D. Evans

  American Journal of Science April 2014, 314 (4) 878-894; DOI: https://doi.org/10.2475/04.2014.03