If you're talking about geological eras, they would be the
Precambrian - beginnings of life, mainly ruled by bacteria
Paleozoic - most basic body forms evolved like insects, amphibians, etc.
Mesozoic - dinosaurs
Cenozoic - humans
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It is the study of time. The passage of time, and the science that deals with measuring of time by regular divisions. Also the assignment of dates to events in chronological order.
Most abstract:1. 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. There are no three "major" divisions.
The Three Divisions were: 1) The monarchy 2) The republic 3) The principate The middle division therefore would have been the republic.
Republic.1) Pre-Republic2) Republic3) Empire
1. Mesopotamian 2. Nile valley 3. Indus valley 4. Chinese and 5. New world