Eneolithic
The Chalcolithic (greek chalkos + lithos, "copper stone") period,
also known as the Eneolithic period, is a phase in the development
of human culture in which the use of early metal tools coexists
with the use of stone tools.
The period is a transitional one outside of the traditional three-age system,
and occurs between the neolithic and bronze age. It is apparently only
distinguished by Archaeologists in some parts of the world, e.g., Europe
and West and Central Asia.
Many Megaliths in Europe were erected during this period.
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