Schoorl Member

Code
NUNASC
Status
Formal (Weerts 2003).
Lithological description

Light yellow to grey very fine to fine sand, calcareous, locally shelly. Thin intercalated palaeosols or peat layers at different levels. Common large-scale cross-bedding.

Depositional setting

Coastal dune (aeolian), interdune swale (pond).

Definition of lower boundary

Base may be marked by shells. Sharp but commonly conformable contact with beach sand (Zandvoort Member, Naaldwijk Formation). Inland, unconformable contact with clastic tidal deposits (Wormer and Walcheren Members, Naaldwijk Formation) or with peat (Hollandveen Member, Nieuwkoop Formation).

Definition of upper boundary

Commonly exposed at the surface. Inland, partly overlain by clastic tidal deposits (Wormer and Walcheren Members, Naaldwijk Formation) or by peat (Hollandveen Member, Nieuwkoop Formation).

Thickness indication
Up to about 50 m (where dunes are highest, near Schoorl).
Geographical distribution
Up to about 5-km-wide belt along the Dutch North Sea coast.
Regional correlation
North Sea: not present; UK: British Coastal Deposits Group with the North Denes Formation (McMillan et al. 2011); GER: Küstenholozän (Barckhausen et al. 1977; Preuss, 1979); BEL: De Panne Member, Vlaanderen Formation (Gullentops et al. 2001).
Age
Holocene (Northgrippian - Meghalayan).
Holostratotype
Well:
B19A1113 (Schoorl)
Depth (thickness) AH:
0 - 5.6 m (5.6 m) below land surface
Origin of name
Named after the village of Schoorl, northwest of Amsterdam.
Previous name(s)
Younger Dune Deposits (Doppert et al. 1975).
Reviewed by (date)
Wim Dubelaar (2018), Sytze van Heteren (2019).
References
Barckhausen, J., Preuss, H., Streif, H.-J. 1977. Ein lithologisches Ordnungsprinzip für das Küstenholozän und seine Darstellung in Form van Profiltypen. Geologisches Jahrbuch Reihe A 44, 45-77.
Doppert, J.W.Chr., Ruegg, G.H.J., Van Staalduinen, C.J., Zagwijn, W.H., Zandstra, J.G. 1975. Formaties van het Kwartair en Boven-Tertiair in Nederland. In: Zagwijn, W.H., Van Staalduinen, C.J. (eds.): Toelichting bij geologische overzichtskaarten van Nederland. Rijks Geologische Dienst, Haarlem, 11-56.
Gullentops, F., Bogemans, F., De Moor, G., Paulissen, E., Pissart, A. 2001. Quaternary lithostratigraphic units (Belgium). In: Bultynck, P., Dejonghe, L. (eds.), Guide to a revised lithostratigraphic scale of Belgium, Geologica Belgica, 4/1-2, 153-164.
McMillan, A.A., Hamblin, R.J.O., Merritt, J.W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03, 343 p.
Preuss, H. 1979. Die Holozäne Entwicklung der Nordseeküste im Gebiet der östlichen Wesermarsch. Geologisches Jahrbuch Reihe A 53, 3-84.
Weerts, H.J.T. 2003. Beschrijving lithostratigrafische eenheid. Nederlands Instituut voor Toegepaste Geowetenschappen TNO. Utrecht.
Cite as
TNO-GDN ([YEAR]). Schoorl Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/schoorl-member.