Ìgbà Ẹlẹ́fun

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 % (150 % of modern level)
Mean atmospheric CO2 content over period duration	ca. 1700 ppm (6 times pre-industrial level)
Mean surface temperature over period duration	ca. 18 °C (4 °C above modern level)

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.

Itokasi

Preceded by Proterozoic Eon	542 Ma - Phanerozoic Eon - Present
	542 Ma - Paleozoic Era - 251 Ma						251 Ma - Mesozoic Era - 65 Ma			65 Ma - Cenozoic Era - Present
	Kámbríà	Ọ̀rdòfísíà	Sílúríà	Dẹfoníà	Eléèédú	Pẹ́rmíà	Tríásíkì	Jùrásíkì	Ẹlẹ́fun	Ìbíniàtijọ́	Ìbíniọ̀tun	Quaternary