When did the Anthropocene begin? A mid-twentieth century boundary level is stratigraphically optimal

@article{Zalasiewicz2015WhenDT,
  title={When did the Anthropocene begin? A mid-twentieth century boundary level is stratigraphically optimal},
  author={Jan A. Zalasiewicz and Colin N. Waters and Mark Williams and Anthony D Barnosky and Alejandro Cearreta and Paul J. Crutzen and Erle C. Ellis and Michael A. Ellis and Ian J. Fairchild and Jacques Grinevald and Peter Haff and I. Hajdas and Reinhold Leinfelder and John R. McNeill and Eric Odada and Cl{\'e}ment Poirier and Daniel D. Richter and Will Steffen and Colin Summerhayes and James P. M. Syvitski and Davor Vidas and Michael Wagreich and Scott L. Wing and Alexander P. Wolfe and Zhisheng An and Naomi Oreskes},
  journal={Quaternary International},
  year={2015},
  volume={383},
  pages={196-203}
}

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