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Brygge Formation

Hordaland Group

Name

English / Norwegian

Brygge Formation / Bryggeformasjonen

Derivatio nominis

From the Norwegian name for wharf or quay.

Original definition

Dalland, A., Worsley, K. & Ofstad, K. (eds.): A lithostratigaphic scheme for the Mesozoic and Cenozoic succession offshore mid- and northern Norway. NPD Bulletin No. 4, 65 pp

Lithology

Mainly claystone with stringers of sandstone, siltstone, limestone and marl. Pyrite, glauconite and shell fragments are seen in the sandstones.

Thickness

450 m in the type well.

Geographical distribution

The Brygge Formation is ubiquitous across Haltenbanken, but it is absent on the crest of the Nordland Ridge.

Occurrences of formation tops in wells

Isochore map TARE-BRYGGE

Type well

Well name

6407/1-3

Location

Drilling operator name

Completion date

Interval of type section (m)

From 2212.5 m to 1762.5 m.

Reference well

Well name

Location

Drilling operator name

Completion date

Interval of reference section (m)

Boundaries

Lower boundary (basal stratotype)

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

Upper boundary (characteristics)

Where the Brygge Formation is succeeded by claystones and siltstones of the Kai Formation the boundary is defined by a decrease in interval transit time on the sonic log and an increase in the density log readings. Where the Brygge Formation is directly overlain by the Molo Member the upper boundary is recognized by an abrupt change from grayish claystone from the Brygge Formation to dark (nearly black) glauconitic sand of the Molo Member. The boundary is further marked by an increase in the gamma ray response and a decrease in velocity readings.

"Reference" seismic sections

Location of section

[figure]

Seismic section

[Colour figure]

Fossil events/zones dating the formation

Dinocyst biozonation in type well 6407/1-3

1762.5 mtop of Brygge Formation 
1770 mLAD Cordosph. cantharellum= Top. C. cantharellum Zone
1810 mLAD Caligodinium amiculum= Top C. amiculum Zone
Unconf. ???
1820 mLAD Svalbardella cooksoniae= Top S. cooksoniae Zone
1820 mLAD Deflandrea phosphoritica 
1900 mLAD Areosphaeridium dictyoplokus 
(Good data recovery below the zoned interval, i.e. to the base of the formation, but no dinocyst zonation defined within this interval)
2212.5 mbase of Brygge Formation 

Dinocyst picks in type well 6407/1-3

Investigated interval. 1760-1900 m

1770 mLAD Cordosphaeridium cantharellum
1770 mLAD Paleocystodinium golzowense
1770 mLAD Pentadinium laticictum
1770 mLAD Spiniferites pseudofurcatus
1770 mLAD Distatodinium paradoxum
1780 mLAD Lejeunecysta hyaline
1780 mLAD Homotrybilum floripes
1790 mLAD Cribroperidinium tenuitabulatum
1790 mLAD Apteodinium australiense
1790 mLAD Dinopterygium cladoides
1800 mLAD Distatodinium craterum
1800 mLAD Selenopemphix nephroides
1810 mLAD Caligodinium amiculum
1820 mLAD Svalbardella cooksoniae
1830 mLAD Thalassiphora pleagica
1830 mLAD Heteraulacacysta campanula
1860 mLAD Cordosphaeridium mimimum
1870 mLAD Distatodinium ellipticum
1880 mLAD Deflandrea phosphoritica
1890 mLAD Deflandrea granulata
1890 mLAD Microdinium reticulatum
1890 mLAD Wetzeliella reticulata
1890 mLAD Chiropteridium lobospinosum
1900 mLAD Phthanoperidinium geminatum
1900 mLAD Dapsilidinium simplex
1900 mLAD Hystrichokolpoma cictum
1900 mLAD Areosphaeridium dictyoplokus

(Good data recovery below the zoned interval, i.e. to the base of the formation)

Age

Early Eocene to Early Miocene.

Correlations

[Graph]

Depositional environment

The sediments of the Brygge Formation were deposited in marine environments.

Remarks

The formation corresponds to the informally used Narvik formation (H6-1).

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