Cretaceous–Paleogene extinction event
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The dinosaurs were rendered extinct by an extinction event. (COMIC: Clara Oswald and the School of Death [+]Loading...["Clara Oswald and the School of Death (comic story)"]) This occurred around 65 million BC, when space freighter filled with anti-matter, which had travelled back in time from the year 2526 aD, crashed into the Earth. (TV: Earthshock [+]Loading...["Earthshock (TV story)"])
At some point in his life, Jack Harkness had to survive on dinosaurs, which he recalled were the "only source of pre-killed food protein after the asteroid crashed". (TV: Fragments [+]Loading...["Fragments (TV story)"])