Tang Formation (Tangformasjonen)

(From NPD Bulletin no. 4)

Rogaland Group


From the Norwegian name for seaweed. The formation corresponds to the informal Bodø formation (H5-1).

Well type section

Well 6407/6-1 (Statoil), coordinates 64°38'29.62"N, 07°52'31.53"E, from 1745 m to 1673 m (Fig. 35). No cores.


72 m in the type well.


Dark grey to brown claystone with minor sandstone and limestone.

Basal Stratotype

The base is defined by an increase in interval transit time on the sonic log and a decrease in density and resistivity log readings.

Lateral extent and variation

The formation thins towards the northeast. It is not present on the Nordland Ridge.


Danian to late Paleocene.

Depositional environment

The sediments were deposited in a deep marine environment.

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