Ameland Member ROCLA

 

Premise After van Adrichem Boogaert (1976) . This definition was adopted by NAM and RGD (1980) with an amended type interval. Since 1980 use of the Ameland Member became more restricted to cover only the situation where the member is intercalated between the Lower and Upper Slochteren Members. Where the Lower Slochteren Member shales out, but a well-recognisable Upper Slochteren Member is encountered (e.g. Terschelling-1 (see pdf) ), the thick claystone interval beneath that Upper Slochteren Member is placed in the newly defined Buren Member.
Derivatio nominis Named after the Wadden island of Ameland
Type section Location map See figure (pdf)
  Well Buren-1 (pdf)
  Location N 53°27’25.4
E 05°48’29.6
  Depth 3581.5 to 3628 m
  Length 46.5 m along hole
  Reference amended after NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well Uithuizermeeden-1 (pdf)
  Location N 53°26’58.9
E 06°48’29.2
  Depth 3041 to 3058 m
  Length 17 m along hole
  Reference interval after NAM and RGD (1980)
Definition Red-brown, sandy clay-and siltstone interval of a highly variable thickness, with some intercalated sand-/siltstone stringers and beds. Anhydritic nodules can be common in the claystones of some intervals.
Upper Boundary The member comprises the strata between the predominantly sandy Lower Slochteren and Upper Slochteren Members. The upper boundary has been placed at the top of the last definite sandstone bed.
Lower Boundary The member comprises the strata between the predominantly sandy Lower Slochteren and Upper Slochteren Members. The lower boundary has been placed at the base of the last definite sandstone bed.
Correlation Towards the southern basin fringe, the member passes into the sandstones of the main Slochteren Formation. Where the Ameland Member disappears, the Upper and Lower Slochteren Members can no longer be discerned. Towards the centre of the basin the Ameland Member becomes part of the main Silverpit Formation where the Upper Slochteren Member shales out.
Distribution The member is restricted to the transition zone between the centre and fringe of the basin.
References See References Permian

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