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) Cenozoic Era (66.0 Ma - present)
                                       (Period) †Paleogene Period (66.0 - 23.03 Ma)
                                         (Epoch) †Eocene Epoch (56.0 - 33.9 Ma)
                                           (Age) †Ypresian Age (56.0 - 47.8 Ma)