Lower Holland Marl Member KNGLL


Premise Definition amended after NAM and RGD (1980) .
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 2384 to 2403 m
  Length 19 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 1408 to 1580 m
  Length 172 m along hole
  Reference NAM and RGD (1980)
  Well Pernis-1 (also known as Pernis-1A) (pdf)
  Location N 51°53’29.0
E 04°23’56.3
  Depth 1824 to 1960 m
  Length 136 m along hole
Definition Generally consists of grey and red-brown marl or calcareous, fissile claystone, frequently with intercalated bituminous claystone beds. On wire-line logs the unit is recognisable by its relatively low GR-response, in comparison to the Vlieland Claystone Formation below, and the Middle Holland Claystone Member above. In the West Netherlands Basin the member is developed as fossiliferous, glauconitic and intensely bioturbated, greenish grey, silty to very silty or sandy, glauconitic marls and claystones (characteristic basal shift in SP-logs). Along the basin edge in the southwestern Netherlands, the member consists of an alternation of sandy/silty clay- stones and argillaceous sandstones.
Upper Boundary The member is conformably or unconformably covered by the Middle Holland Claystone Member, Holland Greensand Member or Spijkenisse Greensand Member, which are easily recog-nised on log character (see above).
Lower Boundary The basal contact with the Vlieland Claystone Formation or the De Lier Member of the Vlieland Sandstone Formation is mildly unconformable. In halokinetically disturbed and very proximal onlap settings the interval can rest unconform-ably upon the Altena Group or older deposits.
Distribution Most of Netherlands offshore area and the northern-central onshore area. This member is absent in elevated parts of the Lower Saxony Basin: Schoonebeek-Coevor-den area, along the northern margin of the London-Brabant Massif, the Groningen High, the Texel-IJsselmeer High (see pdf) , and the Zandvoort Ridge (Bodenhausen and Ott (1981) ; RGD, 1991b).
Age Microfaunal data indicate an Early Aptian age NAM and RGD (1980) for the sediments in the West Netherlands Basin. In the Vlieland Basin (see pdf) and adjoining northern Neth-erlands, Early Aptian sediments appear to be absent, and the deposits are of Late Aptian age Herngreen, Smit and Wong (1991) .
Depositional Setting Deposited in a moderately- to fairly deep-marine setting (middle- to outer-neritic), where fines and carbonates settled. Bituminous deposits indicate periods of stagnant basin-floor circulation. Rare, thin sand layers were formed during storms.
Sequence Stratigraphy On the basis of its age the member represents the full sequences LZB 4.1 and LZB 4.2 in the West Netherlands Basin. Restricted to the Early Highstand systems tract of LZB 4.2 in the north of the Netherlands (see Fig. G.6).
Subdivision .
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].