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How is the Paleolithic Period divided into Lower, Middle, and Upper Paleolithic stages?

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The Venus of Willendorf, a small Upper Paleolithic limestone figurine with exaggerated female features and textured head, displayed against a black background. — Paleolithic Period The Venus of Willendorf, a Upper Paleolithic limestone figurine originally colored with red ochre, 30,000–25,000 bce, found at Willendorf, Lower Austria; in the Natural History Museum, Vienna.

The Paleolithic Period is traditionally divided into three stages—Lower, Middle, and Upper—based on the increasing sophistication of stone tool industries. Anthropologists avoid rigid time boundaries for these subdivisions, as technological advancements emerged at different rates across various regions.12

Lower Paleolithic

This stage spans from the earliest evidence of tool use (approximately 3.3 million years ago) to about 250,000–200,000 years ago. It is often divided into:1
* Oldowan Stage: Characterized by simple pebble or chopping tools.1
* Acheulean Stage: Marked by the development of more complex bifacial tools, such as hand axes and cleavers.1
Some researchers have proposed adding a "Lomekwian" stage to account for even earlier hammering and rock-chipping tools.1

Middle Paleolithic

Lasting from approximately 250,000 to 30,000 years ago, this period is defined by the widespread use of fire and the production of specialized flake tools, such as those found in the Mousterian industry.1

Upper Paleolithic

Occurring from about 50,000–40,000 years ago until roughly 10,000 years ago, this stage saw the emergence of highly specialized tools made from bone, ivory, and antler, alongside sophisticated regional artistic traditions.1