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What are the eras in history?

One of the ways history is commonly divided is into three separate eras or periods: the Ancient Period (3600 BC - 500 AD), the Middle Ages (500 -1500), and the Modern Era (1500-present). According to this classification, the eras last hundreds of years, even thousands of years in the case of the Ancient Period.

What is the definition of historical era?

A historical era is a specific time frame historians have classified due to commonalities within that time frame. Common eras include the Great Depression, the 'Roaring Twenties,' the Progressive Era, the Cold War Era, and numerous others.

What are the eras of time?

Eon, Long span of geologic time. In formal usage, eons are the longest portions of geologic time (eras are the second-longest). Three eons are recognized: the Phanerozoic Eon (dating from the present back to the beginning of the Cambrian Period), the Proterozoic Eon, and the Archean Eon.

What are all the eras in order?

Geologic time units are (in order of descending specificity) eons, eras, periods, epochs, and ages; and the corresponding chronostratigraphic units, which measure rock-time, are eonothems, erathems, systems, series, and stages.

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