Ericson, Ewing, and Wollin (1963) recently defined the Pliocene-Pleistocene boundary in deep-sea cores from the Atlantic and Indian Oceans on paleontological evidence, namely the extinction and evolutionary changes of discoasters and certain foraminifers. Their article prompted subsequent discussions of this “faunal break” by Riedel, Bramlette, and Parker (1963); Bandy (1963); and Jenkins (1964). Riedel et al. (1963) recognized in Pacific Ocean deep-sea cores that similar changes in planktonic microfossil assemblages took place at about the beginning of Quaternary time, but question how closely the horizon marked by these changes coincides with the Pliocene-Pleistocene boundary. Based on...

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