GeologicTimescale

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

   *  CenozoicEra?
        NeogenePeriod?
  23    PalaeogenePeriod?
  65  MesozoicEra?
       CretaceousPeriod?
 146    JurassicPeriod?
 208    TriassicPeriod?
 245  PalaeozoicEra?
        PermianPeriod?
 290    CarboniferousPeriod?
 363    DevonianPeriod?
 409    SilurianPeriod?
 439    OrdovicianPeriod?
 510    CambrianPeriod?
 570  PrecambrianEra?