Category:Chronostratigraphy of the Chalk Group

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The chronostratigraphy of the chalk Group
*data from Gradstein & Ogg (1996)
Lithostratigraphy Period Age/Stage Date* (millions of
years before
present)
Duration*
(millions of
years)
PALEOGENE ← 61
CHALK
GROUP
Danian ← 65+/-0.1 4
LATE
CRETACEOUS
Maastrichtian ← 71.3+/-0.5 6.3
Campanian ← 83.5+/-0.5 12.2
Santonian ← 85.8+/-0.5 2.3
Coniacian ← 89+/-0.5 3.2
Turonian ← 93.5+/-0.2 4.5
Cenomanian ← 98.9+/-0.6 5.4

The onshore Chalk Group succession in the UK belongs to the Late Cretaceous Period, and represents the Cenomanian, Turonian, Coniacian, Santonian, Campanian and Maastrichtian Ages. In the North Sea, the youngest part of the Chalk Group (Ekofisk Formation) belongs to the basal Paleogene Period (Danian Age). The rock intervals corresponding to each of the above Ages are termed Stages, and they bear the same names as the Ages (e.g. Cenomanian Stage etc.).


References

GRADSTEIN, F & OGG, J. 1996. A Phanerozoic time scale. Episodes, 19, 3-5