Upper Holland Marl Member KNGLU

 

Premise .
Derivatio nominis Named after the Dutch province of Zuid-Holland.
Type section Location map See figure (pdf)
  Well L05-01 (pdf)
  Location N 53°44’31.8
E 04°31’44.6
  Depth 2295 to 2371 m
  Length 76 m along hole
  Reference NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well De Lier-2 (pdf)
  Location N 51°58’43.9
E 04°13’39.4
  Depth 1127 to 1279 m
  Length 152 m along hole
  Reference NAM and RGD (1980)
Definition The member consists of light-grey and red-brown marls, and is characterised by a carbonate content which gradually increases towards the top. In the region of Nijmegen an unnamed greensand intercalation is encountered. In- and extrusive igneous rocks of unclear stratigraphic affinity are placed in an informal Igneous Rocks group. The necessity to keep igneous rocks separate from sedimentary lithostratigraphic nomenclature was indicated by Herngreen, Smit and Wong (1991) . At this moment the only formal igneous rock formation is the Zuidwal Vol-canic Formation.
Upper Boundary The top is placed at the 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. Both the lower and lower upper contact appear to be more or less conformable.
Lower Boundary The basal contact, with the Middle Holland Claystone Member, is taken at a 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. Both the lower and lower upper contact appear to be more or less conformable.
Distribution Almost entire Netherlands offshore area and the north-ern-central onshore area.
Age Microfaunal data indicate an Middle to Late Albian, locally even earliest Cenomanian age NAM and RGD (1980) .
Depositional Setting Deposited in a middle- to outer-neritic marine setting, where fines and carbonates settled. Rare, thin sand layers were deposited during storms.
Sequence Stratigraphy Covers Haq (1988) ’s sequences UZA 1.3 Late Highstand to UZA 2.2. Sequences UZA 2.1 and 2.2 have been eroded in places.
References See References Upper Jurassic/ Lower Cretaceous

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].