Use "middle stone age" in a sentence

1. Generalised Middle Stone Age archaeological materials represent the earliest term of reference in the geological series.

2. Some of the earliest evidence of symbolic behavior is associated with Middle Stone Age sites in Africa.

3. The site dates back to the Mesolithic (Middle Stone Age) Period when the English Channel didn't exist.

4. The Acheulean was preceded by the Oldowan in Africa and parts of Eurasia, and it was followed by the Mousterian Middle Paleolithic in western Eurasia and the Middle Stone Age in Africa