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) †Mesozoic Era (252.17 - 66.0 Ma) (Period) †Triassic Period (251.902 - 201.3 Ma) 1 (Epoch) †Early Triassic Epoch (251.902 - 247.2 Ma) 2 (Epoch) †Middle Triassic Epoch (247.2 - 237 Ma) 3 (Epoch) †Late Triassic Epoch (237 - 201.3 Ma)