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The summit caldera of the Rano Kau shield volcano at the southwestern edge of Easter Island (Rapa Nui, Chile). Photo by L. Vezzoli. This well-developed, circular caldera collapsed during the outpouring of voluminous benmoreitic lavas about 0.35 Ma. See related article by Vezzoli et al. (v. 121, no. 5/6, p. 869-886.)