Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       Astra Plinius - celestial bodies
         Universe
           (Supercluster) Virgo-Hydra-Centaurus Supercluster
             (Supercluster) Virgo Supercluster
               (Cluster) Local Group
                 (Galaxy) Milky Way Galaxy veter.
                   (Spiral arm) Orion Arm
                     (Region) Local Bubble
                       Local Interstellar Cloud
                         (Planetary system) Solar System
                           (Planet-satellite system) Earth System
                             (Planet) Earth veter.
                               "history" (Earth)
                                 "global geochronologic units"
                                   (Eon) Phanerozoic Eon (541.0 Ma - present)
                                     (Era) †Paleozoic Era (541.0 - 251.902 Ma)
                                       1 (Period) †Cambrian Period (541.0 - 485.4 Ma)
                                       2 (Period) †Ordovician Period (485.4 - 443.8 Ma)
                                       3 (Period) †Silurian Period (443.8 - 419.2 Ma)
                                       4 (Period) †Devonian Period (419.2 - 358.9 Ma)
                                       5 (Period) †Carboniferous Period (358.9 - 298.9 Ma)
                                       6 (Period) †Permian Period (298.9 - 251.902 Ma)