Category:Lithostratigraphy of the Chalk Group

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Subdivisions of the Chalk Group in the UK sector of the Central & Northern North Sea
PALEOCENE ... ...
DANIAN CHALK GROUP Ekofisk Formation
UPPER CRETACEOUS MAASTRICHTIAN
...
Tor Formation
Mackerel Formation
CAMPANIAN
...
SANTONIAN
...
CONIACIAN
TURONIAN
...
Herring Formation
CENOMANIAN
Hidra Formation