Wikipedia: Three-age system

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The three-age system is a system of classifying human prehistory into three consecutive time periods:

The three-age system is a system of classifying human prehistory into three consecutive time periods, named after the characteristic tool-making technology of the era:

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stone age

bronze age

iron age

* the stone age
* the bronze age
* the iron age

The three-age system is a system of classifying human prehistory into three consecutive time periods, named after the characteristic tool-making technology of the era:

the stone age
the bronze age
the iron age

It was introduced by [Christian Jurgensen Thomsen]? in order to classify artifacts for an exhibition of 1819 at the [National Museum of Denmark]?.