Cretaceous

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Cretaceous Period
145–66 million years ago
Mean atmospheric O
2
content ower period duration
c. 30 vol %[1][2]
(150 % of modern level)
Mean atmospheric CO
2
content ower period duration
c. 1700 ppm[3][4]
(6 times pre-industrial level)
Mean surface temperature ower period duration c. 18 °C[5][6]
(4 °C above modern level)
Key events in the Cretaceous
view • discuss • edit
-140 —
-130 —
-120 —
-110 —
-100 —
-90 —
-80 —
-70 —
An approximate timescale of key Cretaceous events.
Axis scale: millions of years ago.

The Cretaceous, accordin tae present scienteefic consensus, is a geologic period an seestem that spans 79 million years frae the end o the Jurassic Period 145 million years ago (Mya) tae the beginning o the Paleogene Period 66 Mya.

References[eedit | eedit soorce]