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|The Stone Age|
|↑ before Homo (Pliocene)|
The 9th millennium BC spanned the years 9000 through 8001 BC. This marks the beginning of the Neolithic period.
Agriculture spread throughout the Fertile Crescent and use of pottery became more widespread. Larger settlements like Jericho arose along salt and flint trade routes. Northern Eurasia was resettled as the glaciers of the last glacial maximum retreated. World population at this time was more or less stable, at Mesolithic level reached during the Last Glacial Maximum, at roughly 5 million.
|Subdivisions of the Quaternary System|