How Long Does an Era Last?

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An era isn’t a fixed period of time. Rather, it is a time period defined by particular qualities, such as historical events. An era is made up of periods in geology.

Geological eras, according to the Encyclopedia Britannica, span millions of years. According to geologists, the Paleozoic Era, Mesozoic Era, and Cenozoic Era are the three major periods. For example, the Paleozoic Era lasted around 291 million years, while the Mesozoic Era lasted about 185.5 million years. So far, the Cenozoic Era has lasted approximately 65.5 million years, from the beginning of time to the current day.

Certain historical events or an unique span of time establish historical periods. The Elizabethan era, for example, is defined by the reign of Queen Elizabeth the First, who ruled England from 1558 to 1603.

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