1) Paleolithic 2) Period 3) Period of time 4) Time period 1) Paleolithic 
The Old Stone Age period, the earliest stage of human technology; see prehistory. ...
The term for the Old Stone Age, the immensely long period of hunter-gatherers extending from the time when humans first evolved up to about 10,000 BC. In Britain, the earliest evidence of human activity dates from about 450,000 years ago, although there are long periods (of 100,000 years or more) when there appears to have been no human presence. T...
The Old Stone Age period, the earliest stage of human technology; see prehistory