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BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Neogene
 ....Pliocene
 .....Gauss Chron
UFGauss Epoch
 Gauss Normal
RTpaleomagnetism
 upper Tertiary
 reversals
SNGeochronologic division based on magnetostratigraphic normal polarity unit. Mid-Pliocene. Formerly designated the Gauss Epoch.