"Pliocene-Pleistocene" Boundary in Deep-Sea Sediments.
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.
Riedel
W R
WR
Bramlette
M N
MN
Parker
F L
FL