Aerdenhout Member SLDBA


Premise Member defined by van Adrichem Boogaert & Kouwe (1993). The Aerdenhout Member is the new equivalent of the former Lower Delfland Formation The former Upper Delfland Formation (in K15) more or less equates to the Bloemendaal Member and Neomiodon Claystone Member of K18-P03. The Santpoort and Driehuis Mottled Claystone Member of K18-P03 are lateral equivalents of the upper parts of the Fourteens Claystone Member in Q01 (southwest) and K15 (northeast). This unit is identical to the former ’Lower Delfland Formation’ NAM and RGD (1980) .
Derivatio nominis Named after the village of Aerdenhout, in the south of the Dutch province of Noord-Holland. It lies approximately on strike projection from the offshore type locality.
Type section Location map See figure (pdf)
  Well K15-01 (pdf)
  Location N 53°13’28.2
E 03°53’47.6
  Depth 2110 to 2270 m
  Length 160 m along hole
  Reference NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well K18-Kotter-07A (pdf)
  Location N 53°04’56.1
E 03°57’56.8
  Depth 2695 to 2808 m
  Length 113 m along hole
  Reference 105 m TVD
  Well Q01-03 (pdf)
  Location N 52°52’00.2
E 04°08’33.4
  Depth 2122 to 2196 m
  Length 74 m along hole
Definition Sequence of rapidly alternating grey-brown, sandy claystones, siltstones, and fine-grained, light-grey sandstones, with common disseminated lignitic matter. Coal beds are scarce, but have been documented in the reference wells.
Upper Boundary The top is formed by the conformable contact with the clay-dominated Fourteens Claystone Member, which can generally be seen as a sharp upward increase in GR-log readings. The boundary is placed at the top of the last clear sandstone bed. In truncated settings, the top can be the unconformable contact with the Neomiodon Claystone Member, Rijnland, Chalk or Lower Noordzee Groups.
Lower Boundary The base is the unconformable contact with the marine shales or sandy carbonates of the Altena Group.
Distribution Restricted to the western and central part of the Broad Fourteens Basin.
Age Sporomorph associations indicate an Early Kimmeridg-ian age. In the upper parts, a dinoflagellate association similar to the basal Fourteens Claystone Member is encoun-tered. Further down, associations become poorer. Several species of the ostracod genus Cetacella appear to be applicable for detailed stratigraphy.
Depositional Setting Lower coastal-plain to fluvial-plain. Upwards, an increase of marine influence is seen. Fines settled on flood-plains and in small lakes. Sands were deposited by fluvial channels, crevasses, sheetfloods and lacustrine deltas. The presence of abundant dispersed lignitic matter without real coal-beds indicates that swamps did not develop, or that they were eroded and reworked by fluvial processes.
Sequence Stratigraphy This interval seems to represent Haq (1988) ’s sequences LZA 4.4 to 4.6 (Transgressive systems tract). Thus the Aerdenhout Member would be the age equivalent of the Friese Front Formation in the southernmost Central Graben (e.g. L05) and Vlieland Basin (see pdf) .
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].