period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"

Stone Age - (archeology) the earliest known period of human culture, characterized by the use of stone implements

Lower Paleolithic - the oldest part of the Paleolithic Age with the emergence of the hand ax; ended about 120,000 years ago

Middle Paleolithic - the time period of Neanderthal man; ended about 35,000 years BC

Upper Paleolithic - the time period during which only modern Homo sapiens was known to have existed; ended about 10,000 years BC