Middle Holland Claystone Member KNGLM

 

Premise For the sake of purity the lithological affix has been changed from ’Shale’ to ’Claystone’.
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 2371 to 2384 m
  Length 13 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 1279 to 1358 m
  Length 79 m along hole
  Reference NAM and RGD (1980)
Definition Grey and/or red-brown calcareous shaly claystone with a distinctly lower lime content than the under- and overlying members. The base of this member marks a wide-spread (’Albian’) transgression. In some places the transgressive base is marked by a thin basal sand or conglomerate, e.g. in southwestern Drente and in the southern part of the province of Gelderland. These unnamed, thin, coarse clastic beds are included in this member.
Upper Boundary The boundaries with the Lower Holland Marl Member, Holland Greensand Member or Spijkenisse Greensand Member (all below) and the Upper Holland Marl (above) are clearly seen on wire-line logs. The Middle Holland Claystone Member stands out by its higher readings on the GR-log and lower sonic velocities.
Lower Boundary The boundaries with the Lower Holland Marl Member, Holland Greensand Member or Spijkenisse Greensand Member (all below) and the Upper Holland Marl (above) are clearly seen on wire-line logs. The Middle Holland Claystone Member stands out by its higher readings on the GR-log and lower sonic velocities. In certain elevated settings the Middle Holland Claystone Member can rest on older rocks (Niedersachsen Group or older groups in the Coevorden/ Schoonebeek area; Albian transgression).
Distribution Entire Netherlands offshore area, West Netherlands Bas-in, the northern-central onshore area.
Age Microfaunal data indicate an Late Aptian or Early Albian age. Late Aptian sequences seem to be predominantly grey/red variegated, while reddish colours are more typical for sequences with Early-Middle Albian ages. In some wells both intervals are found. The absence of the Aptian and/or the Early Albian sediments in many wells points to an internal hiatus or highly condensed sequence, correlatable with the formation of the Holland Greensand Member
Depositional Setting Deposited in an outer-neritic marine setting, where fines andminor carbonates settled.
Sequence Stratigraphy When of Late Aptian age, the member represents the Maximum Flooding - Highstand of sequence LZB 4.2. When Albian ages are found, the member falls in se-quences UZA 1.1 to 1.3 (Early Highstand). Sequences UZA 1.1 and 1.2 tend to be absent, and LZB 4.2 is often truncated.
Subdivision .
      Formation
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].