"global chronostratigraphic units"
   (Eon) Phanerozoic Eon (541.0 Ma - present)
     (Era) †Paleozoic Era (541.0 - 251.902 Ma)
       (Period) †Devonian Period (419.2 - 358.9 Ma)
         (Epoch) †Late Devonian Epoch (382.7 - 358.9 Ma)
           1 (Stage) †Frasnian Stage (382.7 - 372.2 Ma)
           2 (Stage) †Famennian Stage (372.2 - 358.9 Ma)