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The Stone Age was an epoch on Earth. It predated the Bronze Age.
The First Doctor' first trip with Ian Chesterton and Barbara Wright was to Earth's Stone Age. (TV: An Unearthly Child)
A plot by the Prometheans involved using the ancestral memory of the image of the Sun to revert the minds of those on Earth back to the Stone Age. The Eleventh Doctor was able to reverse this by sabotaging the chameleon circuit in his TARDIS, so that the Blue Box image would be implanted into the ancestral memory of Earth's History. (COMIC: Hunters of the Burning Stone)
According to the Silence, they had ruled the Earth since the Stone Age. (TV: Day of the Moon)