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Consequently in the literature the stone tools used in the period of the Palaeolithic are divided into four "modes", each of which designate a different form of complexity, and which in most cases followed a rough chronological order.
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Obsidian was valued in Stone Age cultures because, like flint, it could be fractured to produce sharp blades or arrowheads.
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.