Code
NUNAWOBE
Status
Formal (Weerts 2003).
Lithological description
Bluish and brownish grey clay, organic, shelly (marine). Intercalated tempestites of fine sand and silt (Westerhoff et al. 1987).
Depositional setting
Ebb channel of moribund tidal inlet, below the wave base (Westerhoff et al. 1987).
Definition of lower boundary
Commonly, unconformable contact with shelly marine sand (Eem Formation), coarse river sand (Kreftenheye Formation), coversand (Delwijnen Member, Boxtel Formation), lagoonal clay (Velsen Bed, Naaldwijk Formation) or tidal sand and clay (Wormer Member, Naaldwijk Formation).
Definition of upper boundary
Conformable transition into shoreface sand (Zandvoort Member, Naaldwijk Formation).
Thickness indication
Up to about 30 m (offshore).
Geographical distribution
Restricted to a former tidal inlet at the coast northwest of Amsterdam.
Regional correlation
North Sea: not present; UK: not present; GER: not present; BEL: not present.
Age
Holocene (Meghalayan).
Holostratotype
Well:
Not yet determined.
Depth (thickness) AH:
Not yet determined.
Comments:
Tentative location: B19A0273, interval 18.60 - 30.00 m below land surface.
Origin of name
Named after the village of Bergen, northwest of Amsterdam.
Previous name(s)
Bergen Clay (De Mulder & Bosch (1982).
Reviewed by (date)
Wim Dubelaar (2018), Sytze van Heteren (2019).
References
De Mulder, E.F.J., Bosch, J.H.A. 1982. Holocene stratigraphy, radiocarbon dating and paleogeography of centra land northern North Holland (The Netherlands). Mededelingen Rijks Geologische Dienst 36 (3), 111-160.
Weerts, H.J.T. 2003. Beschrijving lithostratigrafische eenheid. Nederlands Instituut voor Toegepaste Geowetenschappen TNO. Utrecht.
Westerhoff, W.E., De Mulder, E.F.J., De Gans, W. 1987. Toelichtingen bij de Geologische kaart van Nederland 1: 50.000 Blad Alkmaar West (19W) en Blad Alkmaar Oost (19O). Rijks Geologische Dienst, Haarlem.
Cite as
TNO-GDN ([YEAR]). Bergen Bed. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/bergen-bed.