This is a rough representation of the prehistoric timeline.
The large grey bar at the top indicates the whole of the Stone Age, incorporating the different ages:
Paleolithic (Pink)
Mesolithic (Blue)
Neolithic (Purple)

Not to scale!
The Paleolithic Age is then subdivided into the
Lower (Brown)
Middle (Pale Grey)
Upper (Orange)
Paleolithic Ages…
The whole Stone Age Period spans from 2.7 million to 2000 years ago!
The little green section at the end, is the last 2000 years!