"Pliocene-Pleistocene" Boundary in Deep-Sea Sediments

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Science  14 Jun 1963:
Vol. 140, Issue 3572, pp. 1238-1240
DOI: 10.1126/science.140.3572.1238


Changes in planktonic microfossil assemblages in Atlantic sediment cores, at approximately the beginning of the Quaternary, correspond in a general way with those recognized in Pacific cores. How closely the horizon marked by these changes approximates to the Pliocene-Pleistocene boundary is not yet established.