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Oxford dictionary definition of the word Palaeolithic:
relating to or denoting the early phase of the Stone Age, lasting about 2.5 million years, when primitive stone implements were used.
(as noun the Palaeolithic) the Palaeolithic period. Also called Old Stone Age.
The Palaeolithic period extends from the first appearance of artefacts to the end of the last ice age (about 8,500 years bc). The period has been divided into the Lower Palaeolithic, with the earliest forms of humankind and the emergence of hand-axe industries (ending about 120,000 years ago), the Middle Palaeolithic, the era of Neanderthal man (ending about 35,000 years ago), and the Upper Palaeolithic, during which only modern Homo sapiens is known to have existed
mid 19th century: from palaeo- + Greek lithos ‘stone’ + -ic