Holland Formation KNGL

 

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 2403 m
  Length 108 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 1580 m
  Length 453 m along hole
  Reference NAM and RGD (1980)
Definition Sequence of grey and red-brown marls and marly claystones, locally with fairly thin intercalations of bituminous shale or thicker incursions of greensands.
Lower Boundary The Holland Formation overlies the Vlieland Claystone Formation (in the West Netherlands Basin the De Lier Member of the Vlieland Sandstone Formation), the contact being characterised by a pronounced upward increase in carbonate content, which is reflected by a decrease in GR readings and an increase in resistivity and sonic velocity and a shift in SP-response. This boundary marks a slight but distinct regional unconformity. In more elevated areas the formation rests unconformably on the Vlieland Sandstone Formation, Niedersachen, Altena or Upper German-ic Trias Group, starting with a basal claystone or greensand bed.
Distribution Most of Netherlands offshore area and the northern-central onshore area. Thickness distribution patterns suggest that the depocentre was located in the West Netherlands Basin and eastern Broad Fourteens Basin. The formation onlaps onto the southern Netherlands’ on- and offshore (roughly along the line O18-Biesbosch-Nijmegen).
Age Aptian - Albian/earliest Cenomanian. Biostratigraphic markers are mentioned in Crittenden (1987) Crittenden (1982) and Kemper (1978) , Kemper (1979) , Kemper (1982) .
Depositional Setting Generally considered as deposited in a moderately- to fairly deep-marine setting (middle- to outer-neritic), where fines and bioclastic carbonates settled. Bitumi-nous deposits indicate periods of stagnant basin-floor circulation. Occasional thin sand layers were deposited during storms. The presence of abundant glauconite indicates intense winnowing, while seismic data, thickness differences and reddening patterns suggest the existence of several hiatusses.
Sequence Stratigraphy On the basis of its age, the formation can represent all sequences from LZB 4.1 to UZA 2.2.
Subdivision  
  Over most of the Netherlands a tripartite subdivision of the marl-claystone sequence of the Holland Formation is apparent. In the West Netherlands Basin and southern Broad Fourteens Basin, a fourth unit of glauconitic sandstone is recognised. This unit grades into a shallow ma-rine equivalent along the southern rim of the West Netherlands Basin. The units are:
  KN Rijnland Group
  KNGL Holland Formation
  KNGLU Upper Holland Marl Member
  KNGLM Middle Holland Claystone Member
  KNGLG Holland Greensand Member
  KNGLS Spijkenisse Greensand Member
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].