Upper Holland Marl Member

Formal (NAM & RGD 1980).
Lithological description

Light-grey and red-brown marls, and is characterised by an upsection increase in carbonate content.

Depositional setting

Middle- to outer-neritic marine setting, where fines and carbonates settled. Rare, thin sand layers were deposited during storms.

Definition of lower boundary

Sharp decrease in GR-log readings and an increase of resistivity and sonic velocity character. In halokinetically influenced settings this member can rest unconformably on the Altena Group or older sediments. The lower contact appears to be more or less conformable.

Definition of upper boundary

Base of the chalky limestones of the Chalk Group (or its equivalent basal greensands in the West Netherlands Basin), and this can be observed on wire-line logs as a pronounced decrease in GR-log response and increase in resistivity and sonic velocity readings. This boundary can become quite arbitrary in distal basinal settings. The upper contact appears to be more or less conformable.

Thickness indication
Generally does not exceed 100 m.
Geographical distribution
Regional correlation
UK: Rødby Formation; GER: ~Minden-Braunschweig-Gruppe; BEL: Hainaut Group.
Depth (thickness) AH:
2295 - 2371 m (76 m)
Depth (thickness) AH:
1127 - 1279 m (152 m)
Origin of name
Named after the Dutch province of Zuid-Holland.
Previous name(s)
Reviewed by (date)
Sander Houben (2017).
NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.
Cite as
TNO-GDN ([YEAR]). Upper Holland Marl Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/upper-holland-marl-member.