Gilbert Chron  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Neogene
 ....Pliocene
 .....lower Pliocene
 ......Gilbert Chron
UFGilbert Epoch
 Gilbert Reversed
RTpaleomagnetism
 upper Tertiary
 reversals
SNGeochronologic division based on magnetostratigraphic reversed polarity unit. Formerly designated the Gilbert Epoch.