The Stone Age is called the Paleolithic ("old stone") period by archaeologists, and it covers a vast amount of time. The Stone Age begins when our earliest hominid ancestors started making stone tools some 2.5 million years ago; and it ends only 10,000 years ago, when the entire planet was populated by human hunter-gatherers, and accompanied by our first domesticated animal: the dog.
As a rule, archaeologists break the Stone Age into three parts: Lower (~2.5 million to 200,000 years ago); Middle (200,000-45,000 years ago) and Upper (45,000-10,000 years ago).
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