Supereon: Precambrian and "n/a" or not named yet.2. Eon: Hadean, Archean, Proterozoic and Phanerozoic.3. Era: Cryptic (....many others...) Paleozoic, Mesozoic and Cenozoic.Human history is divided into ages; including the Neolithic, Stone, Iron, Bronze, Middle, Industrial and Digital.