List of time periods

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The categorization of time into discrete named blocks is called periodization. This is a list of such named time periods as defined in various fields of study. Major categorization systems include cosmological (concerning the various time periods in the origin and evolution of our universe), geological (concerning time periods in the origin and evolution of earth ) and historical (concerning time periods in the origin and evolution of mankind).

Human time periods

These can be divided broadly into prehistorical (before history began to be recorded) and historical periods (when written records began to be kept).

Prehistorical periods

In archaeology and anthropology, human prehistory is subdivided around the three-age system. This list includes the use of the three-age system as well as a number of various designation used in reference to sub-ages within the traditional three.

The dates for each age can vary by region. On the geologic time scale, the Holocene epoch starts at the end of the most recent Ice age (around 10000 BC) and continues to the present. The beginning of Mesolithic is usually considered to correspond to the beginning of the Holocene epoch.

Historical periods

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