Code
NUNAWAYS
Status
Formal (Weerts 2003).
Lithologische beschrijving
Light brown to black clay, soft on the lake bed, firm on land, silty, humic, with organic detritus. Locally, clear lamination.
Afzettingsmilieu
Freshwater lacustrine, in former tidal areas cut off from the sea by man.
Definitie ondergrens
Commonly, sharp contact with lagoonal sand and clay (Zuiderzee Bed, Walcheren Member, Naaldwijk Formation).
Definitie bovengrens
Exposed at the surface or on the lake bed.
Dikte indicatie
Up to about 1.5 m.
Geografische verbreiding
Deeper parts of Lake IJssel in the central Netherlands, and a small man-made lake in the southwestern Netherlands.
Regionale correlatie
North Sea: not present; UK: not present; GER: not present; BEL: not present.
Ouderdom
Holocene (Meghalayan, post-1932 AD).
Holostratotype
Comments:
Tentative location: a borehole in Lake IJssel, central Netherlands.
Hypostratotype
Comments:
Tentative location: B49B1840 (Bergen op Zoom), interval 0.94 - 2.55 m below land surface.
Oorsprong naam
IJsselmeer, an inland lake northeast of Amsterdam, formed upon artificial closure of the Zuiderzee inland sea in 1932.
Vorige benaming(en)
IJsselmeer mud (Ente et al. 1986).
Gereviewed door (datum)
Wim Dubelaar (2018), Sytze van Heteren (2019).
Referenties
Ente, P.J., Koning, J., Koopstra, R. 1986. De bodem van Oostelijk Flevoland. Flevobericht 258, Rijksdienst voor de IJsselmeerpolders, Lelystad.
Weerts, H.J.T. 2003. Beschrijving lithostratigrafische eenheid. Nederlands Instituut voor Toegepaste Geowetenschappen TNO. Utrecht.
Cite as
TNO-GDN ([YEAR]). IJsselmeer Bed. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/ijsselmeer-bed.