Stone Age Period of human evolution defined by the use of stone tools. The Stone Age dates from the earliest identifiable broken-pebble tools made by human ancestors c.2.5 million years ago. The period is generally considered to have ended when metal tools first became widespread during the Bronze Age. The Stone Age usually subdivides into the Palaeolithic, Mesolithic, and Neolithic.

Stone Age a prehistoric period when weapons and tools were made of stone or of organic materials such as bone, wood, or horn.