Prehistory referred to the time during the development of human culture on Earth before the appearance of the written word. It was divided into three periods based on the technology used by humans at the time: the Stone, Bronze, and Iron ages. (PROSE: A History of Humankind) Alternatively, it refered to the era of Homeworld history before the anchoring of the thread, (PROSE: The Book of the War [+]Loading...["The Book of the War (novel)"]) which was more usually termed the "Dark Times". (PROSE: The Five Doctors [+]Loading...["The Five Doctors (novelisation)"], The Pit [+]Loading...["The Pit (novel)"]; TV: The Runaway Bride [+]Loading...["The Runaway Bride (TV story)"], The Infinite Quest [+]Loading...["The Infinite Quest (TV story)"])
While attempting to participate in the Dalek invasion of Earth in the year 2415, the Golden Emperor's time machine took him to Earth's prehistoric period, where he was attacked with rocks thrown by primitive humans. (COMIC: The Secret of the Emperor)
Amy Pond was briefly transported to some point this era after becoming infected by a Chronic Spasm Virus, where she was chased by a Tyrannosaurus rex and almost swallowed by a Vortex Predator Bulge. (COMIC: Random History)
Human historians who studied Dalek history believed that Skaro had had a prehistoric era similar to Earth, one that ended when humanoid life evolved, or was transplanted onto Skaro by alien powers. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe) Bernice Summerfield pondered if prehistoric Skaro had been one of the worlds to which the SSSSSSS had sent Aryan DNA samples to, resulting in the Thals' physical appearance. (PROSE: Down)
During the Last Great Time War, the Daleks attempted to time travel to prehistoric Gallifrey, to prevent the Time Lords from evolving, during an era where a large lizard-like species existed on the planet. This lizard-creature was later Time Scooped into the present day by the war-era Time Lords, (PROSE: Engines of War) potentially continuing to exist on the planet after the conflict. (PROSE: A Brief History of Time Lords)