Stone Age
The Stone Age was a prehistoric period during which  was widely used in the manufacture of implements with a sharp edge. It was followed by the Bronze Age. 

The 1939 cartoon film called Daffy Duck and the Dinosaur was set in what appeared to be an anachronistic version of the Stone Age. ()

In 2267,  described the Beta III Lawgivers as "a bunch of Stone Age characters running around in robes". ()

In 2365, Jean-Luc Picard commented that Humans with 24th century technology would have appeared magical to Stone Age people. ()

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de:Steinzeit
Historical eras