Vade Member

Hordaland Group, Lark Formation


English/ Norwegian

Vade Member / Vadeleddet

Derivatio nominis

Vade is a giant from Norse mythology who wades across fjords.

Original definition

Isaksen, D. & Tonstad, K. 1989. A revised Cretaceous and Tertiary lithostratigraphic nomenclature for the Norwegian North Sea. NPD-Bulletin, No. 5, 59 pp.


The member consists of thinly interbedded, light green to grey, very fine-grained sandstones and siltstones. These are glauconitic, slightly micaceous and well sorted.


The member is 72 m thick in the type well 2/2-1 and 60 m in the reference well 2/3-2 .

Geographical distribution

The formation has only been recovered in blocks 2/2 and 2/3.

Type well

Well name

2/2-1 .

Interval of type section (m)

From 2172 m to 2100 m in the type well 2/2-1.

Reference well

Well name

2/3-2 .

Interval of reference section (m)

From 1855 m to 1795 m in reference well 2/3-2.


Lower boundary (basal stratotype)

The lower boundary is recognized by a decrease in gamma-ray readings and an increase in velocity from the claystones of the underlying Lark Formation into the Vade Member.

Upper boundary (characteristics)

The upper boundary is characterized by an increase in gamma-ray response and decrease in velocity from the Vade Member the claystones of the Lark Formation.


Late Oligocene.

Depositional environment

The sandstones of the Vade Member were deposited in a shallow marine environment. Their deposition can be seen as a response to an eustatic fall in sea-level or tectonic uplift in the area. A source area in the east or northeast was suggested by Isaksen & Tonstad (1989).


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