Prehistoric civilizations

The notion of limiting historical study to a roughly 5000-year span, out of a possible few million years of human existence, and of only those few world cultures that left written records, is hardly tenable. It remains a possibility that somewhere between the origins of intelligent humanoids and first preserved artifact, or indeed in the vast periods on the geologic time scale, long before what we call ancient history, there existed sophisticated civilizations on Earth that matched or even surpassed our current one.

 prehistoric civilization history civilization prehistory

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