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

      Zalasiewicz, Jan; Waters, C.N.; Williams, M.; Barnosky, A.D.; Cearreta, A.; Crutzen, P.; Ellis, E.; Ellis, M.A.; Fairchild, Ian J.; Grinevald, J.; Haff, P.K.; Hajdas, I.; Leinfelder, R.; McNeill, J.; Odada, E.O.; Poirier, C.; Richter, D.; Steffen, W.; Summerhayes, C; Syvitski, J. P. M; Vidas, Davor; Wagreich, M.; Wing, S.L.; Wolfe, A.P.; Zhisheng, A.; Oreskes, N. (Peer reviewed; Journal article, 2015)