GeologicTimescale

Numbers refer to end of time period, in millions of years before now.

    *  CenozoicEra?
         NeogenePeriod?
           PleistoceneEpoch? (=Quaternary)
  1.8      PlioceneEpoch?
    5      MioceneEpoch?
   23    PalaeogenePeriod?
           OligoceneEpoch?
   38      EoceneEpoch?
   54      PalaeoceneEpoch?
   65  MesozoicEra?
         CretaceousPeriod?
  146    JurassicPeriod?
  208    TriassicPeriod?
  245  PalaeozoicEra?
         PermianPeriod?
  286    CarboniferousPeriod?
           UpperCarboniferous? = PennsylvanianPeriod?
  325      LowerCarboniferous? = MississippianPeriod?
  360    DevonianPeriod?
  410    SilurianPeriod?
  440    OrdovicianPeriod?
  505    CambrianPeriod?
  544  ProterozoicEra?    |
 2500  ArchaeanEra?       | PrecambrianEon? (as opposed to PhanerozoicEon?)
 3800  HadeanEra?         |