Lokacin Cretaceous shine lokaci na uku kuma na ƙarshe na Mesozoic Era, wanda ya kai kimanin shekaru miliyan 145 zuwa 66 da suka wuce. Ana kiranta da sunan kalmar Latin "creta," ma'ana alli, saboda yawancin yankunan duniya an rufe su da alli a wannan lokacin. Lokacin Cretaceous ya ga ci gaba da juyin halitta da bambance-bambancen dinosaurs, da kuma bullar sabbin kungiyoyi kamar tsuntsaye da tsire-tsire masu furanni. Ya ƙare tare da halakar jama'a wanda ya kawar da dinosaur da ba na ruwa ba da kuma wasu nau'o'in nau'in nau'in nau'in nau'in nau'i, wanda ya haifar da haɓakar dabbobi masu shayarwa da kuma fitowar mutane.