Ìgbà Ẹlẹ́fun

The Ìgbà Ẹlẹ́fun tabi Ìgbà Ẹfun (Cretaceous) ( /krɪˈteɪʃəs/), derived from the Latin "creta" (chalk), usually abbreviated K for its German translation Kreide (chalk), is a geologic period and system from circa 145.5 ± 4 to 65.5 ẹgbẹgbẹ̀rún ọdún sẹ́yìn million years (Ma) ago. In the geologic timescale, the Cretaceous follows the Jurassic Period and is followed by the Paleogene Period of the Cenozoic Era. It is the youngest period of the Mesozoic Era, and at 80 million years long, the longest period of the Phanerozoic Eon. The end of the Cretaceous defines the boundary between the Mesozoic and Cenozoic eras.

Ìgbà Ẹlẹ́fun 145.5–65.5 ẹgbẹgbẹ̀rún ọdun sẹ́yìn PreЄ Є O S D C P T J K Pg N
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Mean atmospheric O2 content over period duration	ca. 30 Vol %[1] (150 % of modern level)
Mean atmospheric CO2 content over period duration	ca. 1700 ppm[2] (6 times pre-industrial level)
Mean surface temperature over period duration	ca. 18 °C[3] (4 °C above modern level)