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The Mesozoic was an era of Earth history best known for the dinosaurs. [source needed]
Silurians were masters during the time, reigning over dinosaurs. (TV: The Silurians, Dinosaurs On a Spaceship, Deep Breath; PROSE: Blood Heat; AUDIO: The Silurian Candidate; GAME: Lost in Time)
The Cretaceous period was part of the Mesozoic era. The Seventh Doctor left Ace in the upper Cretaceous, around 75,000,000 BC. He returned to find her leading dinosaurs to destroy an alien colony being constructed by slave labour. (PROSE: Living in the Past)
Clockwork Repair Droids from the SS Marie Antoinette roamed Earth since the Mesozoic era until they including their leader known as the Half-Face Man fell to the newly-regenerated Twelfth Doctor in the 1890s. (TV: Deep Breath)
The Mesozoic era came to an end with the extinction of the dinosaurs circa 65,000,000 BC, when the Silurians and the Sea Devils were driven underground by a cosmic event. Members of the early Silurian species encountered by the Third Doctor blamed it on a sudden change in the Van Allen radiation belt. (PROSE: The Universal Databank [+]Loading...["The Universal Databank (reference book)"], TV: Doctor Who and the Silurians [+]Loading...["Doctor Who and the Silurians (TV story)"] Some theories included other cosmic phenomenon such as movements of the Moon, or of Earth's twin planet, Mondas. There is also a possibility that the Silurians somehow became aware of the forthcoming crash of a space liner from the future. (PROSE: The Universal Databank [+]Loading...["The Universal Databank (reference book)"], TV: Earthshock [+]Loading...["Earthshock (TV story)"])