Three-age system
From Wikipedia, the free encyclopedia.

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 the Dane Christian Jürgensen Thomsen in the 1820s in order to classify artifacts in the collection which later became the Danish National Museum for History.

The original article can be found at: http://en.wikipedia.org/wiki/Three-age_system.
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